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There is no "Check Engine" light on. The 4wd light doensn't work either, so I suppose it could the bulb, although I doubt it. So I don't think the self-diagnostics is an option. My friend works at a GM/Chevy/Pontiac/etc. dealership, where I might be working on it Sat (in the warm), so is it possible to scan using a tool they may have? Aren't the Snap-On scan tools universal for a certain port?
My plan is to first clean the throttle body and the small sensor on it, possibly what you called the IAC?
I started it up tonight and it didn't sound that bad, its more of a sound of a misfire, an almost hunting sound, rather than a bucking/shaking vehicle type misfire. I doubt it's the wires, although I have heard the caps and rotors are bad on these 4.0's (not sure I believe it).
The old plugs were Autolite (ugh, I hate autolites) and 1 or 2 Bosch. I've had my Jeep get a bad plug, so I replaced these straight up (out of character for me to replace anything on a daily driver). The plugs were not the light tan color I was hoping for, but weren't bad. Only a very very slight black carbon coating. Rotor, cap, and wires are money I just don't want to spend.
I've been doubting it was the cat, and I'm going to replace everything from the cat back tomorrow (its all rotted and needs replacing).
I'll report back tomorrow with my progress!
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