help 02 8.1l with new wiring
 

hi i need help with my 02 chevy 2500hd
we have had hell with this truck but we love the truck and will never get rid of it.
ok so we change a few things and now i have pending codes

p1688 unmanaged engine torque delivered to tcm signal mod18

p0342 cam position sensor a bank 1 ckt low input mod10

p0700 transmission control system malfunction mod10

. we had to change the stock wiring harness to a howells after market 8.1l harness
had to get an 03-04 custom tune pcm from nelson performance blue and green plugs
new T.A.C part number 12588923 03-04
new trottle body 03-04
new petal sensor
every sensor on the motor is new .
truck starts and runs fine it has a hard start problem all the time and now are tranny dont want to shift right , it shift at 3000 rpm all the time in drive and dont down shift at all and win coming to a stop it act like its going from 5th to 1st gear and wants to push the truck forward. tow mode light comes on to but nothing happens. what im missing here ????.