Thread: Stumbling...Missing...

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Well, I got her put back together warmed her up set timing check carb.....every thing's ok. So off for a drive we go.....wow it's running good. I take her home and pop the hood re torque the bolts and I noticed I didn't hook up the alternator(left the wire zip tied to a fender support) so I hook it up and take her for another ride....now it's running like garbage again. Unhook the alt it runs good again.
So now the question is how can the alt make it run so poorly? It's a new 100amp 1 wire deal....

Now that we're back, I thought I'd post what was up....

After reinstalling the intake I gained 1" of vacuum, so I did have a small leak. It wasn't the real issue.
After finding (by accident) it ran fine with the alternator unhooked I replaced it, and guess what.....it still had the same problem.
I came to the conclusion that it had to be the ignition box (a brand new HyFire VI-AL) so I replaced it with an MSD-6al.....It's run flawlessly since.
For what ever reason the ignition box could not handle more than 12 volts once it got warmed up.....go figure.....

Thanks for your time and input......