I'm not new here and have been reading posts for quite a while...

I've currently had a 6# lower pulley chnage on a SVTL 01 and have since had problems... The car has had the correct tuning and has a CAI by JLP... Here's the problem...

At half throttle the car is normal and has always been... Once im at WOT the car just won't go! It's like someone put a sock in the fuel line! The car begins to shudder and drop... Im getting normal reading's on the boost gauge... I've had all the sprakplugs changed to NGK (Like they were before) It's been like this for about a month and everytime i ask someone no one knows whats wrong! It's not one of the coils cause ive had those recently changed (bout a week ago)

(PS: The problem is only at WOT not anywhere else...)

NEED HELP! SERIOUS HELP!!!

Thanks!

 

My first guess is a problem with the mass air meter/TPS functions that send signal to the PCM has been upset in some way.

 

Fuel pump and or filter?

 

Sounds like fuel starvation. I'd check pressures at WOT.