[Bob Mulry]

Just a heads up.......

About 40 years ago I had a similar problem with my MSD-7AL..

Race car would idle and take a throttle snap fine...

Put it in gear and all was OK...

When we went to drive the car it would stumble almost to the point of killing the engine..

Drove me crazy and I almost rebuilt that car from the ground up..

I found that the problem was a high resistance connection in the power circuit to the MSD..

It would light a test light..

MSD ignitions, depending on load such as large plug gaps, suppression plug wires and add to that the engine load of trying to accelerate, can draw up to 15 amps..

The higher the load the more the draw..

The MSD will stop firing, the load is reduced, then start working again..

Using a test light is useless to track this down and you need a Volt-Ohm meter to check the resistance in all of your power and ground connections..

I spent a lot of time tracking this down on our 350 Super Stock engine..

I hope that this helps