Thread: Highway Issues

Im back again for some advice! I recently noticed on the highway the car will jerk when I let off the gas, and usually around 70 MPH. The RPM will bounce around while it does it. It almost seems like its fighting to stay running. It does it on cruise and not on cruise, and if it is on it will do it only when it needs to let off to maintain that speed. Here's what ive done to the car so far: New gas tank, new EVAP system, Fuel filter, New plugs & Wires, Had the injectors cleaned, New radiator, Hoses, Flushed and switched to the green, T-Stat, PCV valve, Air Filter and regular oil changes. The car has high mileage so I switched it to full synthetic. I recently to the tranny pan off and put new fluids in as well, didn't fully flush it tho. The car hasn't thrown me a code at all so im in the dark. Any ideas would be awesome, the community has been awesome with helping before so I hope I can get somewhere to start! Thanks, and I appreciate it!

motor mounts maybe ?

wouldn't it happen constantly if it was the motor mounts?

I talked to someone and they said check the IPS idol positioning sensor. Said it may not always throw a code for it

Make sure your not getting any leaks between your air filter assembly and throttle body. I had a bad gasket right at the throttle body with a slight crack and caused a lot of problems, yours is very similar to one I had. As the crack got bigger the car would totally stall out when getting of the gas. Cheap easy fix?