Car has been working great, but today a new problem started. During fairly hard acceleration, the engine suddenly seems to "miss and hit" for a second. Almost like opening secondaries, but quicker. It's a hiccup of an accelerating engine, not a pop out the exhaust or carbs.
Very difficult to describe, but almost like a shot rod bearing allowed the piston to hit the head for a second. So it could be a mechanical problem with just rebuilt engine, but there are no signs such as smoke or metal in the
oil.
I suspect a carb issue. I have twin vacumm Holley's with the light springs installed. I checked the vacumm hose connecting the two secondaries and found it accidently bent down under the ignition wires, but it seemed "crack-free" other than that.
Not sure what symptoms to expect if a power valve failed.
Anyone got any ideas for this "hard to describe" problem?