hi people!!! i have just fitted a stage 1 superchip and i think its fucked. the car runs fine for about 15 mins then if i rev any higher than 3000rpm it has no power and sounds like its overboosting or misfiring. i took the chip out and it runs fine again. i got the chip from e-bay its not new. has anyone had the same problem or knows what could be causing this to happen?