Engine stumbles then falls flat...embarassing.
I have an old corvette that I have been noodling around with for many years. My 69 Camaro is my main focus but the vette is fun, if not irritating to drive at times.
The problem with it is that after warming the engine up and letting it sit, it wont idle. (454, 650 Holley spreadbore, stock 390 HP cam, exhaust, distributor, 4 speed) I drive it for about 45 minutes and it warms up, drives and idles perfectly. Vacuum is steady at 20 and it idles right at 700 rpm's. But after it sits for a while I get in it to do some more driving and the engine will not idle. It stumbles and the only way to keep it going is to keep the idle up with the accelerator pedal. I replaced the stock Quadrajet with the new Holley because it did the same thing. I thought I had solved my problems.
I am pretty sure it's fuel related but cant nail this problem down. I have a similar engine going into the Camaro and if this happens to it too, the garage must have been built over an old cemetery.
Anyone have any ideas?
69 SS/RS Fathom Green 454 4 speed
Bumper sticker- My other auto is a .45