When I am driving my Envoy it does fine, but when I am idling the RPM's jump up and down until it dies. Also I just had to have some work done on the electrical system so I am not sure if that could have anythingto do with it.
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Sounds like a vacuum problem. Do you have a seemingly hard brake pedal? If you do chances are your brake booster is leaking vacuum. If not check your vacuum lines. Your heater system is controlled by vacuum.
Well if its at idle then it should be under 1000rpm. If its always there while driving and the rpm should read more and then just shuts off while its still running, you could have an ignition module issue.
That part you can take to an autozone and have tested for free. If the module is fine then it may just be the gauge gone bad.
WHEN EVER YOU DISCONNECT THE BATTERY.THE PCM WILL LOSE IT MEMORY PCM HAS TO RELEARN IDLE POSITION.SOME TIMES DRIVE AROUND BLOCK FEW TIMES CAR WILL RELEARN TO IDLE.IF NOT GO TO DEALERSHIP.THEY WILL RESET IDLE.USING A T ECH 2 SCANNER.THEY PROBABLY CHARGE YOU $35.00 OR LITTLE MORE.
Sounds like ac compressor is dragging.It might be that rpm is to low also.Step on the accelarator and if you have a tach bring rpm up to 700 to 800 in drive which is were it should run with ac on. With ac off rpm should read around 600 in drive.