need help from auto mechanic

[Ether]

Originally Posted by MrForbes

I second the hammer suggestion. Worn brushes.

I hope you're right. Better that than an engine computer problem.

I'll give it a try tomorrow afternoon after the kickoff.

But in the meantime, can you think of (an even remotely plausible) reason why this happens only under the conditions described in the OP ? That's the part that's stumping me. I've repeated this about half a dozen times over the course of the past week and it always follows the described pattern.