Had the Vette out today, ran flawlessly for some 10 miles in local traffic. Eighty degrees, clear sky. However, when I went on an onramp to I-80, while accelerating moderately, the engine suddenly stumbled like the fuel was turned off, came back on in a second, but abruptly stumbled again and came back on.....It was such that I was certain I was going to be stranded on the onramp, but then it stopped whatever it was doing and continued on accelerating up to abt 70mph. Ran flawlessly again for the 10 or so miles on I-80 back to the OFFRAMP in my neighborhood, whenslowing down to about 45 mph, as soon as I gave it some gas to maintain that speed, the engine coughed quickly three times in a row, and then settled down once again....and the Vette ran the next few miles in city street/terrain flawlessly again.
So what in anyones opinion was causing the "cutting out" the other times and what if anything to I need to check. The gas was good as I had recently (the day before) filled it up, not stumbling or hesitation on normal driving around town.
It ALMOST seemed to me, as if the power/electricity ITSELF was what was cutting on and off, but I can't prove it...it was just a 'feeling'. Otherwise, everything ran and operated normally. Clues, Ideas, anyone? I'm hesitant in taking anymore drives until I know for sure.....

 

damn, that is a wth feeling.
guess the shake stuff and hope it shows itself

 

I would start by checking the fuel filter. If there is one in the carb, I would change it out. Check the sock in the fuel tank and also check for dirt or debris in the tank as well. It could also be a dirty needle and seat in the carb. Others should chime in. Jerry

 

One thing you could do is remove three or four plug wires off one side of the distributor cap. With clamps released turn the cap on its side. Take a dry shop towel and thoroughly wipe the inside of the cap removing carbon tracking. If there is excessive amount of carbon, then it maybe time to install a new button / spring under the coil. They come in High Resistance or Low Resistance. ($17)

Next, remove rotor. Note if any wire under the rotor is rubbing the dizzy case itself. Move the mechanical advance and check again. Sometimes there is chaffing of a wire to GRD.

 

Also check the harness connections to the distributor. The “batt” and “tach” connections, but more importantly the 3-prong behind those two. A loose, deteriorating connection on the 3-prong will give intermittent cut out of ignition. Check that the copper terminals are not loose in their plastic housing.