I bought a 97 obs with 5spd swap...the swapper didn't mess with the ecu...so here's the issue while driving and Comin to a stop I usually downshift and compression brake bringin the Rpms up and when I get to a complete stop the car starts to idle rough and feels like it's missing if I turn it completely off and start it back up it will run fine again...been driving it like an auto the last couple days(while coming to a stop I just push the clutch in and use the brake only instead of compression braking) and I haven't had any issues...it is throwing a couple codes