curious what a running compression check # is vs normal compression
do you have headers , probably a dumb idea but spraying water with a little water bottle is a way of seeing if it's heating up and actually firing. or temp gun
gosh you wouldn't think any carb circuit or carb issue would cause this.
vacuum gauge at idle doesn't produce any weird erratic needle movement ?
just some ideas but man that is strange.
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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