Engine Performance problem
1973 Other Lincoln Models V8 Two Wheel Drive Automatic 82000 miles
1973 Lincoln Mark IV 460ci
Last Thursday I filled my tank at a Sunoco station with 93 octane with my lead additive, later that day I participated in a hot rod/classic car cruise for hours at idle speed. The next morning, my car started easily. But in turn has a rough idle speed or stall, slight but noticeable engine vibration, slow rev, serious loss of power, from the line almost takes 10 sec to get to 60mph, and lets not forget Horrible gas mileage. It has a touch of a gas smell out of the exhuast, but NO smoke/ moisture of any kind. And a very so slight ping noise and it backfired slightly out of the carb, like a popping or a burp, but no BANG.
I have cruised many forums looking to trouble shoot my issue. And all the possibilities lead to the same outcome. Granted my parts are $10 here and 30 there, but on this path I could be in the $100's of dollars before I get it right.
within the last 3000 miles I have replaced: cap/ rotor, wires, plugs, fuel filter, ignition coil. All was fine till that day of sudden lack of all around performance.