grounding

Grounding! Per the after market wiring system I am using you can "never have enough grounds".

My Negative battery cable is run to a starter bolt. You could run a ground from the starter bolt to to a frame rail or just run it to your negative battery post. It won't hurt and you could rule that out.

Also, as stated above the timing could be off.

Those are a couple of simple things your could rule out right away.

Good Luck.