Quote:
Originally Posted by Arl37
69 C10 307 with 700R4. In 4th at 65 the car pulses like I have the timing set to fast or someone is very light pumping throttled pedal as they cruse. Timing set at 4 degrees BTDC like manual says. Dosent do it in 3 rd. New HEI dist and wires. New Edlebrock Performer 4 barrel. Stock other than headers. Truck runs great except for pulsing. Dont think it did this before I installed new Performer but I cant be sure. This truck is a interior gutted rebuld and just finally started driving to try to get all bugs out of it.
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Is it rpm related like the engine reving up and down? You can install an rpm gauge and monitor it but also check the vacuum advance and all the vacuum hoses to make sure there's no vacuum leaks anywhere.
Since it doesn't do it in other gears, I suspect it's something in the transmission but since I'm not a tranny person, I don't know what.