B4 Surging

[ej25tt]

had the same trouble. to the point some times flat foot, and NO acceleration. turned out a big end was on its way, the knock sensor picked this up, and sets it in limp mode. also, check your fuel pump/filter. it may be lacking fuel pressure, leaning slightly, causing pinging, and the knock sensor to be triggering safe mod in the computer!

[Murfb4]

could of also been the FPR when the car come on boost under low RPM the FPR can maxout and run the car really rich causing a surge

[hawks123]

Thanks guys but the car is long gone.