Anyone any ideas ???

Car starts fine and runs fine until i stick my foot down, approx 3000rpm sometimes about 5000 onwards, it lacks power and stutters. It feels like a misfire but car runs ok otherwise. Sometimes it runs no problems.
Recently i fitted a boost gauge and tried getting intercooler off to change starter motor.
Could i have loosened a pipe somewhere or is it something more serious ??

Cheers
jay

 

I'll start the ball rolling with the usual suggestions of Coil pack(s), HT Leads (if present), MAF, spark plugs. Its a common issue and there's loads of info around for each of the above items.