hi there, i hope someone can give me some advice, my car used to have good and bad days, but now it's playing up all the time, when it comes on to boost it stutters, the car judders and it won't hold boost at all, it drives like an xr2i, but if you put your foot down gently, it doesn't judder so harshly when it reaches boost.
i've tried a different map sensor, dump valve, breathers, boost hoses, filters, and it's starting to get me down.
the car is standard apart from a k and n filter, dump valve, and an uprated actuator that was on the car when i bought it. if anyone can give me any help it would be greatly appreciated. thanks nathan