Quote:

My 70 Plymouth 440 (4 speed) has been "lunging" when I coast at low speeds. It idles fine and runs out great through the gears. Only time I notice it is when I am 2,3, or 4th and just kinda coasting at low speeds.....440, Holley 750 Street Avenger,stock heads, Edelbrock Performer manifold and Hughes Whiplash cam. Can you guys give me some advice on what might be going on here and how to straighten it out? Thanx



440+750carb=lean.
My guess is a lean surge is what your experiencing. Just my guess. Jet it up some and see if I'm right. When you unplug the vacuum advance you are just applying a band aid and missing out on good cruise power and mileage.