Question about 1965 Ford Mustang

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Pulsating gas pedal in low speeds, if you go really easy on the pedal untill ~25, it will not pulse at all.

In my '65 comet i have this awful pulsing in the gas pedal, from a stop, if you give it some gas and it begins pulsing and reving up and down to the pulse of the pedal. So far it seems to be only happening in low speeds. It's an automatic c4 transmission, 1965 mercury comet 404 with 289/2bbl carb. Car is so old this website doesn't even have original manufacturer Edsel motors or the Model - Comet. So seeing as how its close enough to a mustang..

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  • wdmshmo May 21, 2009

    It also acts like it wants to shift from drive1 into drive two, automatic c4 transmission on the column is P, R, N, D1, D2, L.

    The shifter pulls when it pulses.. leads me to think the torque converter is not functioning properly or somethings not alligned.. maybe just a linkage.


  • wdmshmo May 23, 2009

    It's also making a noise in the rear-end, there's quite a bit of play in the drive shaft. The engine mounts look decent enough, but i'll check them closer soon.

    It looks like i'll be changing out the rearend with something that can handle more, motor mounts, and transmission overhaul before i put my 351clev heads and 4bbl on it.
    Thanks guys.


  • yadayada
    yadayada May 11, 2010

    broken engine mounts cause this.

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  • 22 Answers

Make sure the carb is bolted tight to the manifold too. Loose nuts can cause this.

Posted on May 20, 2009

  • smokin_duall
    smokin_duall May 21, 2009

    Shifter moving definitely indicates motor mount. Check them out, a car that old will have problems with all the rubber parts.

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