Thanks everyone----I found the issue to be a bad coil---it became evident when lifting plug wires-nice arch appeared on the coil---so replaced Coil, plugs and it now runs great.
Thaks for the reply---I do not have Flowscans and I don't recall the transmision-Everything was working fine until lately-Think I will start with checking plugs-wires first then go to the rebuild if needed. Nerver worked on Rochesters before.
:huh: I have '89 340 EC with twin Merc 454. I had replaced plugs and wires last year on starboard eng--cap and rotor this year--started out fine this year but have now devloped the smell of raw gas in the exhaust--(I changed the cap and rotor after discovering this issue). Max RPM has been...