Take it to a auto parts store and get the codes pulled for free. Have a pen and paper and write the codes down then post them on here. Do Not buy your sensor at the auto parts store. Those cheap sensirs dont last if they work at all. Get a oem sensor from the dealer and do the job once and correctly.
SOURCE: '07 Tahoe; check engine light on steady. Just came
Have a dealer or garage check your Oxygen (O2) sensor. As a quick fix, try disconnecting and reconnecting your car battery. Sometimes this will reset the check engine light.Good Luck!
SOURCE: Engine idle problem. Range Rover 4.6 HSE 1998 Have
sorry but you have tried everything i would have done except that i would have checked the engine breather pipes for deterioation like perished or soft and collapsing .you would be surprised how often this is the main cause of this sort of problem
SOURCE: Code P0121 on 2006 GMC
Classic signs of idle air control not able to cope with sudden engine loads. Cleaning should resolve this. Remove ducting from air cleaner to throttle entrance. Spray with carb. choke cleaner or WD40 spray and wipe back to the alloy finish. clean the the throttle plate and push the throttle open with your fingers and clean in behind as best you can. Clean the passageways to the idle air control valve. Remove the valve and give it a thorough clean up. Reassemble and it should all be good.
Also check manifold vacuum at idle the best you can hold an idle. I have run into timing belt being one tooth off and engine still ran fine. But the vacuum was low that's how I could tell the belt was a tooth off.
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