2002 QX4:Error Code P1320

The printout from Autozone reads:
BBIngnition signal, primary circuit intermittent.
Probable cause
BB1. - Open or short circuit condition.
BB2. - Poor electrical connection.
BB3. - Failed power transistor.

Does anyone have any suggestions on how I can try to fix this problem myself?
The car runs rough every so often at stop lights or while warming up.
Any input is greatly appreciated.