Thank you guys for all the great suggestions. You wouldn't believe how frustrating this has been... or maybe some of you would.
I've asked my son about the diagnostic scope. He was actually telling me about the capability to graph voltages the other day. Not sure if he'll be able to swing that.
I didn't mention this before, but when I first had engine problems 6+ months ago, the first thing I did was replace the coil with a new 6V coil from Napa. When that didn't fix the problem, I did the full tune-up, using the condenser from Jon, and the new coil. That was when the truck ran great for 15 minutes the first time.
My son tested the primary/secondary resistance of both coils the other day and they were pretty close to the same. This was on the workbench, not while in use or in a warm/hot environment. Short of having the scope, is there a better way to test a coil?
Now I'm wondering if my original condenser went bad, causing my initial problems. And the new coil I installed is also bad, killing both condensers I've used since putting it in.
If I can't get the scope, I'm thinking I may go back to using the original coil with another new condenser and see what happens.
