Where to start 94 sls
 

Hi long caddy fan here. Just picked up a 94 sls and it has a few codes the idle/rpms jumps around just a little and the transmission won't shift right and sometime shifts hard when going into drive or reverse...I pulled codes. Thanks

P023-icm circuit malfunction
P025-icm 24x signal circuit malfunction
P076-transmission pressure control solenoid
Circuit malfunction
P086-trans gear ratio
P094-shift solenoid A ratio problem