need help on a 1993 ka

[chriz789]

the problem is my ka keeps after firing iv changed out 3 fuel injectors then my car started after firing checked the injectors one of the ones that i changed out broke so i changed it a 2nd time and the car was runing maybe a good 3 hrs when the fuel injector stops working. before i changed it out the 2nd time i had an oil change done changed the fuel filter changed the spark pluges and spark plug wire. what can be the cause for this ??? what should i do ??

[Azrial]

what do you mean after firing? Back firing? If it's back firing it could be a lot of things. exhaust leak, faulty air injection diverter valve, timing could be off, or an egr problem.