92 Mustang 5.0 trouble codes

To start off a few months ago my car just suddenly shut off, couldn't retrieve any codes what so ever, scanner not communicating, so replaced ecm with a rebuilt one, car started up and ran fine for a few drives, decided to try a 17 mile drive to work, no problem going, but on the way home, every sharp bump car stumbled, got home thought it might be the maf harness, extended due to meter in fenderwell. tapped meter, changed idle, then check engine light remained on, figured bad maf, changed out meter still have check engine light with following codes- 56, 66, 82 and 98, 56 and 66 are high/ low voltage at maf, 82 secondary air bypass circuit, and 98 hard fault. Any suggestions on where to start

Forgot to mention that car is a convert from aod to t-5, I did cut back the harness and solder in a new wires and plug for the maf. That changed nothing.