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its Not onstar, you have a short.

Do you have a check engine lite?? Get it scanned and if it pops P0171 and 172 That's a vacuum leak. I'd look at ex gaskets. as far as running Cleaner in the engine every 3 mo. that's over kill. you...

If computer in truck came from and Auto Tranny. then it needs to be reprogramed. That's why your getting codes. its looking for senses on and auto and it does not know how to set. as far as High Idel...