help need .my car runs fine but in 3 and 4 gear at 2000 to3000 rpm the car back fires and the rev counter jumps alittle this happens every time, past 3000 revs and the car runs fine.i have tried a dissy off another car and it did the same thing,also checked the timing and this is spot on,and check plug gap and they are ok.please help because i am running out of options

 

maybe get it to a tuners and get it remapped?

 

what car are we on about?

Get to a tuner and get a setup, 60 quid problem solved

 

its a escort s2 1989 mfi amhed bayjoo chip