Great ,we appreciate your detailed report. The truck runs fine. The problem is the operator had an older wire cable throttle ( GC25 ) in the past, they switched him over to the newer unit ( GC25K) and there complaint is - first thing in the morning ( cold , Canada eh ) they start the unit and the unit has lack of power and low throttle response, the Red triangle with exclamation comes on intermittent and the driver shuts down the unit, We advised them to start the truck and allow a warm up period to get the engine to operating temperature. After a long period of complaining from the operator, we now have the unit in our shop we hooked up PC and found the high DWELL the manual says good running operation should be set to 40-50% but will readjust with temp and atmospheric pressure from 20-80%.

this is the head scratch-er. we can remove the idle screw from the carb completely and the unit runs fine ?????

We will review your comments and triple check everything. Do you or anyone else have any literature on this??

Thanks