So the check engine light came on and and I had Autozone pull the code and it was for a misfire in cylinder 4. Does that mean its constantly misfiring or would one misfire set it off? It runs the same as it did before and the plugs have about 2000 miles on them. Ive only had the car maybe 4 months (2003 WRX) and it has 118k on it. Its always had a hesitation thing off the line at low RPMs until you wound it up but I assumed that was the so called turbo lag these things have. But I assume the light would have come on sooner if that's the case.
Do you think a bad coil pack or injector would cause it or could it be a one time misfire that set off the light?