My car was find until i put some gas in it now it stumbles and backfires. i checked my spark wires and 1,3,4 had an affect on the engine but 2 didnt it stayed running. i did the same on my fuel injectors and the same happened. my car still runs but awful whats going on
200 plymouth neon 114000 and i think it is 2.0 or 2.2
4 cylinder