only thing else to suggest is to start cleaning all grounds, connections, etc. If electronic, make sure ecm is grounded good, no wires have any breaks/or have been pinched. inspect dizzy. also you could have gotten off a tooth if you pulled the dist. if dropped in properly you vac. cannister should`nt hit the coil. It could be so many things, and their is alot of threads on stuff like this, do a search, in the ignition forums, Bolt that coil down tight! try that first. good luck.