[silicon212]

Originally Posted by bobss396

I'd explore the cheap and easy route first. It sounds like you might have a sticky intake valve or a gummed up lifter. Add a pint of Marvel Mystery oil to the oil, drive it around as best as possible for a week. Not beating on it, just slow and steady maybe around the neighborhood for 15 minutes or so or until the engine is fully warmed up.

Pour some of the Mystery oil down the carb while its running. Crack the throttle by hand so it won't stall out. It'll smoke like crazy, but around a cupful should be all you need to do. Take it out for a ride afterward to clear out the plugs and combustion chamber.

Since the thing does idle smoothly, I don't think that you have any internal issues.

Bob

Bob, I've had a few cars with bad cams, they all ran the way his runs - very smooth at idle, smooth with unloaded acceleration, popping and spitting under load.