Originally Posted By Lefty
Any ideas on what the heck is going on?

work

Check the voltage across the coil with the key in the "run" position when cold and you're getting a good spark. Check it again when it's weak and the motor dies. If the voltage is the same then the problem is for sure one of the ignition parts or a bad ground. Remember the ignition box case has to be grounded to the firewall or other good ground. Same for the frame/firewall to engine ground strap. Check the ignition box case to the engine with an ohm meter, you should see .4 ohms or less.

I ran a new ground and new 12+ directly from the battery to the control unit as a test, and had cleaned the battery to frame and battery to motor grounds. All read what I thought was good with an ohm meter, but will recheck the box to motor for .4 or less ohms.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky