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You might try replacing the PCM temp sender. If it's flaky, it can cause the PCM to mess with the fueling when it shouldn't. Otherwise, it sounds...

Instead of a fuse, stick a test light in the fuse terminals. When you activate the 4WD, if it lights brightly you have short. And, you can re-use...

Disconnect the electrical connectors at the axle, then try a new fuse. This'll let you know if it's at the axle or somewhere up the harness. As I...

I would go with the cable system. When you need 4x4 you need it......The Thermal systems are sketchy at best... POSILOCK comes to mind. This...

Probably a dead short somewhere, or the thermal element itself. Good luck finding it. You have alternatives. Update the diff to a modern stepper...

okay thanks Sea Foam never hurts

I always hate bearing that bad news, and avoid it when possible. Before diving into a new pump, I'd go over the list I posted, make sure everything...

ok thanks. I was hoping wasn’t inj pump but looks like I’ll have to bite the bullet or scrap it

It is possible, but unlikely you'd only see the codes and the SES lamp occasionally. It sounds like more than just that, though. The PCM should have...

is it possible that only optical sensor is faulty

That leaves the injection pump, especially with DTC 17 and/or 18, which are pump internal fails.

thanks for replying. Now I realize I should have given more info. Truck ran like this all last summer. Engine light comes on occasionally with code...

Welcome aboard! Is the SES or STS lamp on? Will the engine speed increase in P or N? If so, it's likely the wastegate, wastegate solenoid valve,...

it wasnt the speedo cable it was the shift linkage at the trans.. my bad

Speedometer cable? Depending on the year and the options many had skid plates from the factory. I would have a look at a friend or neighbor's...

Might try Jensales.com they might be of help I remember the 671 inline Detroits came in 9 different configurations not counting left and right...

Thanks for you input. There is no tag or plate on the valve cover. It does have a 24 volt starter & alternator, you are correct. No big deal...