could be a combination of mentioned things... it runs rich cause there are no emissions ( so does mine ) and your timing is probly off. the ecu wont over compensate enuff to make fire... i dont think... mine doesn't lol... try resetting the timing... cant hurt... did u take the emissions off when you did the gasket??? if not then u need to allow the ecu to reset anyways.. which i suppose could be the problem... try unplugging your batt. cable for around 15 min.... to make sure it resets itself.... then try.. but try timing first...