My problem is when i am accelerating up in rpms around 12 to 1500 rpms it sounds like the engine flat lines for a second or two. You here the power and the noise of the injectors, then it sounds like a very low humming with no throttle response, then picks up again. When it is really cold out you can see excessive smoke out the tailpipe when the engine does this. I have also noticed that my mpgs have dropped quite a bit. It seems like this all started after the dealer changed the FICM. any thoughts, thanks.....:read: