Requesting a helping hand in determining an acceleration problem. I suspect the problem is either the acceleration pedal or throttle body.

Problem: When the engine is warm and the car is at a complete stop, it takes approximately 1/3 throttle to get the car moving; moving at granny acceleration speed. After a couple of seconds the engine responds with acceptable, but less than normal, acceleration. When the engine is cold (running for less than 5 minutes) throttle response is normal and acceleration is good.

Observation: With the engine warm, stationary, and in park, slightly pressing on the acceleration pedal results in increasing RPM, but the increased RPM tends to creep-up well after the pedal remains in the newly fixed position. Example: engine at 1,000 RPM; press and hold throttle, engine speeds to 1,500 RPM then slowly creeps to 2,500 RPM and the holds at 2,500 RPM.

I did follow directions for resetting the ECU. It did not help. Age of the fuel filter is unknown. It needs to be replaced as the car sat unused for a couple of years before I purchased it.

Vehicle is an early 2004.