serious ? on 1995 Mercury Tracer

95 mercury tracer, chugged on acceleration, it was a plugged converter, now since i got new converter, after driving a lil while it makes a popping noise and the check engine light comes on, today i drove it it made a popping noise no check engine light on, now it acts like it wants to start but won't just makes a popping noise

1 answer
if not a direct fit it may be put on backwards