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i have a 1977 ford 460 engine. runs great down the road. she is a very hard starter when she is cold, lots of pedal pumps to get her going. she idles like she has a huge cam while cold and after driving 50 miles. the weird thing is that every so often at a stop light or when i park it idles completely smooth.
i was thinking it is a vacuum leak that occasionally seals itself. the problem with that theory is i have plugged all vacuum ports while parked and it still idles rough. my second theory is that it is something with the ignition or timing but i don't know where to start looking.
can a carburetor cause this type of behavior? any suggestions on how to diagnose and fix?
thanks
additional details: this is a stock engine out of a 77 ford van. the only non-factory components are the edlebrock carb (8867) and the adapter plate to attach it to the ford intake manifold.
i was thinking it is a vacuum leak that occasionally seals itself. the problem with that theory is i have plugged all vacuum ports while parked and it still idles rough. my second theory is that it is something with the ignition or timing but i don't know where to start looking.
can a carburetor cause this type of behavior? any suggestions on how to diagnose and fix?
thanks
additional details: this is a stock engine out of a 77 ford van. the only non-factory components are the edlebrock carb (8867) and the adapter plate to attach it to the ford intake manifold.