my cossy is miss firering at nearly full and shuts down. it ony happens when boosting i have changed the map sencer to an other 3 bar one i put new dizzy cap and arm on.and put grp A coil on. checked all the gaps on crank sencer and the one in side the dizzy it just back firers and holds back as if it has blown the spark out its got 803 dark green inj t4 turbo pace intercooler amhed bajo chip the car does not get used much but seems to be worse now oh yes its qc 57 plugs in many thanks if some body can help me with my poorly saff

 

leads ?

Id get into a tuner if it was me there not that expensive and can be cheaper than swapping out uneccesarry bits

 

T4 and greens often = dead engine. Get it checked professionally.