Well, I've decided that my stumble/surge isn't ignition related. What about my fuel pump or missing fuel injector? When at a idle, the rpms hold at around 700. Then it'll drop 50 or so and go right back up to 700rpm. Also, whill driving the car stumbles periodicly. I't alsomst feels like it's running out of gas. But only for a brief moment this happens.

87 350 TPI

 

How long has it been since you changed the fuel filter? It could possibly be a fuel pump going out or even a vaccum leak as well

 

Sounds to me like a vacuum leak somewhere. I get the same thing while driving, a small stumble that feels likt there was no gas to shoot into the combustion chambers. I think my culprit is my crappy Stock Replacement fuel pump that cost me somthing like $40.

So its either of those. Perhaps a manifold vacuum leak too.

 

It's probably been about a year sence I replaced the fuel filter. Also, when I'm in the lanes holding the rpms at around 2500 I get the same stumble.