[72swb_327stroker_?]

pull the plugs... That could tell you more than any thing we can offer as speculative advice.

pull each plug and note what cylinder each one came from so that you can "READ" the plugs and get a better idea of whats going on with the motor.

It may or may not be an ignition problem.

1.How old is your battery? Are all the terminals, grounding points, and straps clean and corrosion free? Battery cables look good?

2.How is the carb? New? Old? Rebuilt? What type?

3.How much Gas is in the tank? Do you have a fuel pressure gauge, or regulator?

4.What type of plugs do you have and when was the last time you gapped em? Check that all the plug boots are sitting on the plugs properly, and not jumping spark from any frayed wires.

5.Do you have a back-up ignition module?(might wanna pick one up) if so swap it... if its doing the same thing, you can rule this out.

6.Are you running an external ignition box? (msd type)

7. Does it idle fine, but only misfire(sputter&cut-out) under a load or when driving? Or is it constant? Does it worsen when the motor is warm?

Answering these question can give us a better idea of what might be the problem

Cheers!
Eric