I bought my 2008 Chevy impala maybe 6 months ago with 180k miles. Maybe after a week of driving it I had noticed the acceleration was off.
When i push down on the gas pedal from a stop the engine revs up normally. Once I get to about 35 mph the acceleration hesitation becomes noticable. With steady pressure on the gas pedal the rpm’s will jump up and down. When I try to put more pressure to the pedal there is always a serious delay until the pedal is at about 60% of the way down the engine will suddenly rev up to 2500 rpms.
I had done some research and thought that the problem was bad solenoids. I took the car into a transmission shop to have then look at it, but they had told me the transmission had no problems except for the trans fluid being a little burnt. They told me the problem was probably engine misfiring, so I replaced the spark plugs which had made the problem a little better but did not completely fix it.
I did more research and tried cleaning my mass airflow sensor and testing my tps sensor, but with no real results.
I was hoping someone with more experience might be able to help me diagnose this. I’m thinking it’s probably a bad sensor or some other electrical problem, but I’m not an expert.
P.S. thank you to anyone in advance for responding. I can also post a video if that will better explain the problem.