I have a 74 with a stock 350. I just purchased the car last week with the power brake booster not working. This was changed today and now the car starts fine but after warming up and putting it in gear, R or D the RPM drops and unless I press on the gas it will die.
The car idled and went into gear without stumbling before the new booster was put in. I also had a problem with on of the headlight actuators and that was replaced as well.
I pinched off the booster vacuum and no change, when I put the car in gear the idle drops and the car will die if I leave it there for more than a few seconds. I checked the timing at it is as 8 degrees.
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