While driving uphill sometimes my Alero'* rpms will pulsate. If I let off the gas it seems to quit. I took it in to a mechanic and nothing abnormal was showing up on his computer and he couldn't get it to act up on his test drive. Does anyone have any ideas? Its a 2000 Alero 3.4L with about 140,000 miles on it. Thanks!
im with mike, i have had plugs and or wires wear to the point you can feel them and not set any codes. my moms 04 imp, she let go to about 140k and the gap was like double. that set no codes either and didnt drop mileage. just was running rough