Originally Posted by johnbmw
yes the car is getting worse after the fuel pump change as well. I have to take it to BMW. I have no choice. $$$$$$
if you turn the car off and restart it, it works fine. then the minute you press on the gas too hard it loses power and the car shakes. a restart will clear it once again.
First, dont take it to BMW, you are just wasting your $$$...
Take it to a GOOD BMW shop, the list of sponsors here, or many others.
If a restart fixes the problem, obviously its something electronic. (a restart will not clean your fuel filter!)
I would look for vacume leaks, sometimes under hard acceleration the engine will move (also check engine mounts!) and a cracked intake boot will suck in air...causing a missfire.
Also check camshaft sensors, they tend to do the same.
And last; doest the check engine light come on? (it should) and have you got it scanned? What regular maintenace have you done in the last 7 years?