I got a 96 3500 that had the 0411 pcm conversion done on it. It wasnt running and i messed around with it A bit got it to run when i took out the cylinder 1 plug but as soon as i put it back it it dies. Im lost and dont know to much about these things. I got it as a project and would like any help possible thanks

The distributor cap has developed an arc path between the main and #1 electrodes. Basically #1 is getting fire for every cylinder before the arc even passes through the rotor. Replace cap.