Our car has had a the engine rebuilt about a year ago. A couple months later it began to bog down when taking off from a stop, sometimes it will backfire. The engine like stays on all the time. That started several years ago with the light. We jus put a rebuilt ECM on it and changed out two more sensors. That makes about 7 08 sencors that have been changed out in the last year. Even with the PC changed out it is still doing the same although for one whole day the engine light staid out and drove really well. Next day same ole same ole. HELP!