Hi pbluman, Welcome to 2carpros and TY for the donation
Inspect and test all the following listed below and get back with some results
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.
Note: If it doesn't apply disregard.
February, 27, 2013 AT 1:41 PM
I am having the same problem. I have noticed it when I start from a stop and the engine is relatively cold (first 5 minutes or so) or if barely pressing accelerator on highway. If I put the hammer down it goes away. Interested in answer as my dealership wants major $$$ everytime I go in there.