Sup guys, so today after i stopped for some food, my car started shaking. Had a feeling it would be misfire or something but when i started driving, I started smelling a lot of fuel inside the car. Checked under the hood and nothing was leaking. My exhaust was spitting out hella white smoke also. recently changed my head gasket due to a blown one. so the fuel smell went away and now i smell something burning. its coming out from my exhaust and i can smell it around my headers. Earlier in the day i switched ecu's. They were both pr4s. Would one of my injectors be out?? i recently took out the injectors to clean them also and i used new o-rings. And the CEL would go on and off! **** this is frustrating. Any feedback would be great. thanks.