Car dropped 250 RPM and is now stuttering

nm9stheham said
Did you go back and plug the vacuum line to the distributor vacuum advance and check the advance at 2200 RPM, as well as at idle?

Your battery and electrical system voltages look normal. Now just check one more spot: voltage into the MSD unit.

Set the engine at TDC and remove the distributor cap, and make sure the rotor is pointing directly at either #1 or #6 spark tower. Look under the cap and at the rotor carefully for any odd appearance.

Use a vacuum gauge and look at the vacuum in the intake manifold at 'idle'.

Are you talking about the voltage going from the battery to the MSD or from the bulkhead to the small red MSD wire?

I did have the carb tuning shop put the FBO plate in the distributor. Maybe they messed up somehow and it just now made a difference.

skizzo said
Dont just plug the vac advance, take it completely off the dist. I had a buddies car doing the exact same thing, the vac arm was causing a binding. Took me about a week before I threw my distributor in and figgered her. It was an accel or msd unit.
Its not bad gas lol.

Skizzo, when you say "take it completely off" do you mean get a distributor without a vac advance?