OKay i hjvae 64 deville turbo trans. recently installed a Holley 600 cfm carb to it after the intake manifold was fixed by deleting choke tube. but because i put new heat riser on years ago and it was pricey i didnt cover the exhaust ports up to the intake. just installed new vacuum advance and ignitor 1 ignition module. But the carb and ignition seem to be okay but the fluctuating manifold vacuum ( 18 to 21 HG fluctuating) i keep getting is telling me there is a sticking valve. OR i missed something completely, if there is a valve sticking can i remedy it without pulling the heads off. there 55,000 original miles of this old girl.

p.s while i was setting the timing back to 5 degrees i couldn't get it to stay idling with car in drive vacuum advance , brake booster and modulator plugged and unhooked virtually no leaks.

thanks all

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Comment by Tony and Ginny 429 on September 24, 2015 at 10:48pm
My info above is for a 64 with a carter carb ,but the idea is the same
Try lubrication to free up the valve
An oil change and a quart of marvelous mystery oil to the crankcase
That oil gets into places regular oil does not ,as it is thin and slippery
Comment by Tony and Ginny 429 on September 24, 2015 at 8:40pm
Turn up the idle adjustment screw ,until the car will idle for you ,a bit faster than normal is good
You need to have the engine off ,to do that ,if it's a 64 with a carter carb
Just 1/8 turn ,car on to see if it holds car off etc ,until it idles
Work with the idle and timing to get both correct
Start with a little higher idle ,set the timing - then lower the idle and reset the timing ,until both are where you want them to be
Vacuum advance plugged and carb inlet plugged
Once set correctly ,rev the engine ,with the timing light on the crank pulley ,to see and watch that you timing is advancing up the crank pulley as it should ,and is working correctly
That will get your timing set

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