After replacing distributor with Petronix which started Monte quickly on a cold start. Drove out of garage in reverse, no issue. Letting it run for a few minutes then put in first gear to move back into garage it shuts down - it started up again without any issue, put in gear again, it shuts down again.
then almost didn’t get it to start but got it running. Had to press on gas to Keep it running after putting in gear.
my 4bbl Rochester carb was rebuilt by local shop 2 years ago that improved with braking and moving forward at red light.
am I experiencing vacuum issue? If not, what am I experiencing? And what solution to resolve this?