hi all i have been running a 150 main jet for a while and the car has been over fueling. as i have turned the boost down to 16 psi i thought a should put a 120 main jet in and see what happening on the lm1. once fitted the 120 main the car idle fine and on wot it pull's well but on part throttle it lean out and try's to die. any idea's? the 120 is all clean not blocked?