Any ideas? In the past I have had a similiar issue and put a new harness from key switch on and it seemed to have solved problem (1 1/2 yrs ago.) But truck will start and run but especially going up hills or if I step on the pedal it hesitates and not always but more often now it shuts down. After coming to a stop it will restart and idle but usually have to limp it home. Trying to solve problem I just changed the fuel filter, but it really did not help the issue.
1995 chev. 6.5 turbo diesel
230 k - 100k on engine.