As im driving, my car goes back and forth between 3 and 4 cylinders. I checked the spark and im not getting spark to the #1 cylinder.

The Wires are new, and the dizzy has never given me a problem.

When I am driving with only 3 cylinders, my car chugs like crazy obviously, but its blowing a lot of fuel out of my exhaust, and theres smoke coming from my header due to engine shaking.

What are some things to look for?

Injectors are good, spark plugs just replaced. My guess is either bad ignitor or coil, how do i test it?