My mechanic tried to install an MSD 2-Step but couldn't get it to work. They specialize in mustangs and the one mechanic has an 02 GT too. They spent hours on the phone with MSD tech support who told them that the unit was bad. I sent it back and they sent the same one back to me and said it checked good on their end. The mechanic tried it again but still no good. Any advice? Maybe they're missing a key step in the directions or somethings not mentioned?  

is it the Launch Matster?