Jeep problems. Transmission?

[nc00xj]

While driving yesterday. Out of the blue, I would be going 35-50mph and when I would accelerate my rpms would tank, speedo would tank and my jeep would shudder really hard till I let off the gas and would sporratically do this for a few seconds and then stop. Then randomly happen again a few minutes later.
Pushing the gas harder made it worse.

My thoughts are either my torque converter is going out.
TPS is going out. Fuel pump going out. Or I'm misfiring.

2000 xj. 207,xxx miles. Regularly maintained. Not sure of the transmission maintenance history.
Checked the tranny fluid and it was fine.

[4.3LXJ]

By tanking, you mean your tack and speedo went to zero? How about the rest of the gauges?

[nc00xj]

They didn't go to zero but tach went from 2k down to like 700 and speedo went from 40 to 10. Changed my spark plugs and that might have fixed it. No issues since. Probably misfiring considering my gap on the old plugs was 20thou too big

[4.3LXJ]

OK, keep an eye on it

[nc00xj]

things were going great then the same symptoms but worse started occurring. id be driving and out of the blue it would completely cut off while driving. thought it might be my alternator so i replaced that. Didn't fix it. Then i replaced my coil boots and springs which seemed to fix it. i then drove it 1200 miles from North Carolina to Iowa without a single issue till the last 300 miles. threw a code for running lean bank 1. popped the hood and there was what appeared to be fuel all over my intake manifold around cylinder 3/4. finally got to my destination with the worst MPG ive ever had in my life. replaced my upstream O2 sensor. code went away running great no problems. then a day or two later it was doing the same thing as before. i was driving and then it randomly cut out. i would have to wait 5-10 mins before i could start it again. finally got it started and it would run fine in neutral but once i put it in gear it would start to stall and id have to keep in the gas to get it going. then it would die again so id repeat the process to limp it back home. cam and crank pos. sensors were replaced 6 months ago. tps replaced. cant figure out what it is. do i need to re-index my cam. pos. sensor?

living in iowa now, really have to figure stuff out before i get parts because the part store is 45 mins away instead of 5 mins like it used to be haha

[4.3LXJ]

You say upstream O2 sensor? You mean both of them?

[nc00xj]

ive only found two O2 sensors on my xj. upstream(right after the manifold before the cat) and down stream (right after the cat). apparently some 2000's had 2 and some had 4 (california emmisions)

[4.3LXJ]

All of the ones I know of in 2000 had four sensors. Is your motor and exhaust original?

[nc00xj]

yeah original motor and exhaust. where are the other two located then?

[4.3LXJ]

Your header should be split, with a pipe and cat on both. Those cats had one in front and behind. But on the single, the other O2 sensor is down stream of the cat

[nc00xj]

Changed my crank position sensor and thought it was fixed but it just did it again today.
Thought my fuel pump might be going out so I did a pressure test and I'm running at about 50psi at idle. Just turning the key to the on pos. Primed the fuel rail to 42 psi and stayed there for about 15 mins then slowly dropped below 40 psi.

Not sure what it is.

[prerunner1982]

Have you tested the TPS?

[nc00xj]

Just replaced it

[prerunner1982]

Just replaced it

Im sorry. I missed that part.

[nc00xj]

Still trying to fix it. Went through and cleaned and upgraded all my electrical grounds.
Finally threw a code that stayed long enough I could read it. P1648. Been trying to troubleshoot it by testing my tcm and pcm ccd connections and wires and can't find any issues. Finally got a video of my gauge cluster while it was acting up just not sure how to post it on here

[4.3LXJ]

If you upload to youtube first then post the link here it is fairly easy

[nc00xj]

http://youtu.be/HHfd_AaTgX8

[4.3LXJ]

This is not a tranny problem. You have an engine problem instead. How long since you have changed your crank position sensor? That is probably a secondary cause of your tack jumping like that. The first thing I would look at is your cam position sensor in your distributor. Also, if you can get a multimeter, check resistance on your coil. If you can find one I will post the test procedure for the coil.

[nc00xj]

I don't have a distributor. The crank sensor was changed a couple weeks ago. Cam position sensor was changed about a year ago. Maybe I need to re-index the cam position sensor? Also, would that cause the p1648 code? Showing "no bus" on my gauge cluster?

[4.3LXJ]

No buss on the gauge cluster can be caused by a poor connection at the back of the cluster. The tach jumping around is caused by no spark from the plugs. That code is not on my list, however that code is used by Chrysler for control module signal problem. That is about all I can tell you on that code. If however your ECM is going bad, then that would explain a lot of it and the code