Rough idle

[steph74]

but then when you have checked and established that it is off you can;t adjust it anyway right ?

[4.3LXJ]

It is adjustable by rotating the distributor.

[greenchevy]

Ill check the timing when i get a chance. It drives fine just doesn't idle.

[4.3LXJ]

The reason I asked to check it is that some engines with computers will stumble at idle if the timing is advanced. It keeps trying to correct itself and will have a miss, which the ECM will try to correct for by readjusting the timing and opening up the IAC. It sounds like yours may be doing that. Anyway, it doesn't cost anything to check it.

[uberxj92]

absolutely 4.3lxj! also check the cps if it is dirty or loose. my 90 renix had the idle issues & backfarting thru the airbox ( which sounded so cool with the snorkel). i ended up replacing the cps & all of the seals on the injectors. one of them had a slight leak. like a mini pin hole in the seal.

[greenchevy]

I've replaced the fuel injector o-rings already and the crank. I bough a DRB 2 scanner. SO lets hope I can get to the bottom of this. Thanks for the help everyone