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First of all, losing your AC will not cause the vehicle to overheat, just cause you to be uncomfortable. Have somebody check the wiring harnesses and make sure they aren't frayed or corroded.
I'm not sure about this, but since the car is a GM owned vehicle, you may be able to bring it to a Chevy or GMC dealer. I would call and ask however.
If it is in over drive, then a short pause and then acceleration is normal. However, if it occurs outside of OD ten it could be a dirty throttle body, bad plugs, or dirty injectors.
This could be an issue with fuses. Your best bet is to go to your local auto parts store, but a box of all different kinds of fuses, and replace the ones that indicate the problem areas for your car in the manual. If this doesn't work, it could be a wiring harness. Also, replace the battery in your FOB.
Hey! I blew my last engine in my Bonneville (stupid teenager I know) and I recently dropped in a used one. It was running rough and had a CEL (check engine light). I cleaned the EGR valve with a steel brush and carburetor/throttle body cleaner as this is what I was told to do after the code was diagnosed. After I refitted the valve, the car ram much smoother for around 5 miles. But then it started running rough again. I have cleaned it twice now and this problem continues to occur. Any tips on how to fix this? Thanks!