Rpms have been very erratic?

2007 CHEVROLET IMPALA
147,200 MILES • 3.5L • AUTOMATIC
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BSM1984
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My rpms have been very erratic. I barely press on the gas and it's going to 3000 rpms. It's gotten worse especially after at stop signs and red lights.
Just had an oil change and serpentine belt replaced this past Monday. I had more transmission fluid added in June no leaks from that. Also my gas mileage has gotten worse. It did give me a p0700 code today that's the first time
Aug 22, 2026 at 8:31 AM
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