If you don't smell gassy exhaust or black smoke/soot from the tailpipe(s) then I'd look at a plugged fuel filter, weak fuel pump, partially plugged idle circuit or float level too LOW. If you see black smoke/soot then float level too HIGH, blown power valve or leaking float needle/seat. Also to be considered if it starts hard and is down on power is a slack timing chain that has jumped a tooth or two, a restricted exhaust or weak spark. Check your transmission fluid...you could have a ruptured vacuum modulator diaphragm sucking fluid into the engine but should have corresponding white smoke. Throw a vacuum gauge on a manifold vacuum source and analyze the readings.
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