Maybe someone can help, I have a 5.3 I just transplanted into my jeep. I modified the harness and had the computer redone. The motor idles fine (about 800rpm), once it gets up to about 140 degrees, the idle drops and jumps between 400 and 600rpm and starts to load up pretty bad but only on the drivers side. I get no check engine light either.
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Help Support Hardline Crawlers :
5.3 idle issues
- Thread starter jeep46
- Start date
YOUNG
Well-Known Member
What was done to the computer? Do you have the O2's hooked up? Do you have the temp sensor hooked up? The engine could be going to "limp mode". Check all of your sensor and insure that they are all working.
