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Level: Hummer (H2)
Stumbling XJ
I have a '99 with the 4.0. I put a new long block in it about 30,000 ago. Until recently it has run great.
Now, it starts right up and runs smooth when cold, after about 1 minute it starts running rough and backfiring through the intake. Then after about another minute it smooths back out and runs fine until I shut it down and it cools off again. I replaced plugs, wires, cap, rotor, air filter and it still does it.
Any ideas?????
Super Moderator
Re: Stumbling XJ
yes, O2 sensor is wearing out. How long since you changed it?
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
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