1966 Mercury Comet stalls when warmed up

1966 MERCURY COMET
67,070 MILES • V8 • 2WD • AUTOMATIC
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PAUL AHRENDT
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just had shop put in rebuilt C4 tranny. idle spd was too high,and tranny shifted hard. When I drive it short distances I have no problems. Its when I drive more than 4miles, or on freeway that stalling begins. My car stumbles and acts like its not getting enough fuel. if i try pumping gas pedal, it cuts out. stalls motor. If i let off gas pedal it stays running at slower and slower rate, until attempts to maintain speed cause it to stall. What i have tried so far has failed to stop this behavior. This is what i have done so far.. 1)adjusted choke cold idle spd down, adjusted both air/fuel screws one full turn out past "bog" point. So now car idles nornally, and shifts smoother also. 2)replaced air & fuel filters, added gas treatment. 3)checked fluid levels. Stalling behavior pursists.
Oct 14, 2009 at 8:12 AM
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HMAC300
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from what you describe, i would take a fuel pressure test, meaning flow as well as pressure. then go into distributor and check breaker plate for wear and vacuum advance for wear at pin and pin hole. I am assuming this has the original distributor with points. It could also need a carb overhaul as well, due to age and the alcohol in todays fuel. Especially if this has a plastic float in the carb.
Nov 12, 2009 at 7:08 PM