My husband has an 03 Big Dog Chopper. It came with a Twin Tech 1005 ignition module. The bike ran great over 50mph, but ran shitty below that, and stalled a few times. He purchased a new mechanical ignition, installed it, and when they tried to turn it over it back fired. Now there is no spark to the plugs. Changed out the coil from another bike (that we know worked) and still no fire. My husband is getting frustrated. We are send new ignition module back to have it tested. Any thoughts as to what could be the problem? We could really use help!