I've had an old school DP tuner 4 position chip installed in my truck for probably 13-14 years with no problems at all. I've never even upgraded any programs since it was original. Lately in only the 60hp position and warmed up the truck will misfire and buck and surge when giving just a little bit of throttle past float going down the highway. It does not do this in any other chip position. It's too late in the week and day to call for tech support so to get me starting troubleshooting in the right direction, Is it possible for a single program to go "bad"? If it was a contact issue with the chip to the ECM would all of the programs be acting up, or is it possible a contact issue would only affect one program?