A
Anonymous
Guest
the car holds back at 4500 and if i put the peddle down it sometimes clear,some times it back fires when this happens,i have checked the fault finder and it flashes 55 which is good ,have changed the plugs ,dissy,rotor arm,the car is running on a blitz boaster box on low it 16 psi on high it 28 psi,any ideas on why this happens,and when the tank is low and i go to fill up ,take off the fuel cap the tank seams to have a vacum,is this normal,thanks for any help :?: :mrgreen: