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theres about 4 million things that it could be. but my father inlaw had a gq come in once with the carby loose and only held by one bolt. needless to say that ran (amazingly) pretty average. its amusing to see that as soon as theres a problem with a gas car everyone assumes thats its the gas. lol. Im guessing its prob an air leak somewhere since its both fuels. id run the gas from an oxy over your inlet while its running see if it changes revs and id move everything a little see if it helps find the problem. could be an old cracked hose or blown gasket. on another thought has it backfired cos thatl break stuff too.