Engine light on Code P1351

If there is not an IDM edge (coil firing) for every PIP edge (commanded spark event), the PCM will look for a pattern of failed IDM events to determine which ignition coil has failed. If the ignition coil cannot be identified or if the engine is running and there are no IDM edges, the IDM circuit is malfunctioning (P1351).

So how do I go about repairing this issue?

Actualy I think I know why the code is coming up now.
Before I did the Hydro brake booster swap I had a engine light coming up for a vacum leak cause my old vac brake booster was leaking. during that time as I was gathering parts stil for the hydro booster I had swaped out the ignition modulle, and it ran fine. looked at the old ignition module and new one and realized the last 2 alpha letters had been both different. I went over to teh dealer and had the parts guy run both numbers and the old one pointed to a different alpha letter as well. So I' waiting for tuesday to get here to get the new one that I need. I read on the board somewhere that thye had created 2 different Ign modules and one sends a signal to the ecm telling it that the spark had fired to the coil.