Okay so my z is completely stock excluding the intake, just a k&n, and I've replaced all the injectors with newer style ones being I had two bad injectors when i first bought the car, it has 61k on it and as far as i know it could possibly have low compression in 1 or 2 cylinders. I haven't checked yet. My problem is it won't go past 6psi and I don't know what to do. I've ruled out that its not a bad temp sensor but not sure where to go from there, no lights are on so i assume its not detonating but I don't know so i need help please.