Backfiring out one side.. Need some help..

[commercialcobb]

sorry, I meant it does NOT backfire all the time, and when it does, its under load or WOT

[Slo-poke]

Double check Dizzy cap . Strange things can lead to crossfiring inside the cap. Look for tracks from one cyl to another and the coil to a cyl.

You can also short one plug at a time to perhaps isolate it to a particular cyl. ,when you find which one , then the fun starts. Look at all the wires in the dark, see if a wire is sparking over to another. The wrong wires such as solid core with a msd sys can lead to a lot of grief.

Others who have more experiance with Msd systems please chime in !!

Good luck
now back to my ghost water leak
Gary. aka Slo-poke.
Classic 429 enhanced with lots of expensive parts !

[Gaz64]

I have used MSD and had similar issues.

Just check the MSD website forum.

ICE ignition will fix your issue.

Have bought ICE twice for 2 cars and never had an issue.