I have a 1997 half ton 4x4 chevy with the 6.5 turbodiesel, relocated pmd, manual wastegate, with 4l80e not sure if any of that will help in the diagnosis but figured I'd include it anyway,
My truck stalls out like someone turned the key off only during light acceleration and only when the engine is cold (warmed up but not at road temperature) I've already changed the pmd which was my first instinct inspected the wiring harness for shorts cleaned and checked the entire fuel system including tank with no improvement. I've been stalking this site quite awhile and have always found answers here except to this, I've had injection pumps go out on other trucks and air in the lines on this truck, this just doesn't act like that no stumbling, coughing, or sputtering, just immediate shut off and immediate start up as soon as I hit the starter is there anything on these that can cause my shut off solenoid to disengage only when cold or a possibility of my optical sensor causing this or anything else I should check before dropping the cash for a new injection pump? I don't want to go to that trouble and it not be the issue. Lift pump and ops are both new and working well also.

 

I had the same issue with a 98. Turned out to be the ignition switch.

 

This ^X2

 

I had considered that but was kind of ruling it out because it worked fine after it warmed up but I've got a spare from a parts truck I can slap on it and see if it improves thanks

 

Changed the ignition switch to no avail but someone on diesel place suggested to bend the prongs on my fuel shutoff solenoid plug a little to make better contact and that the cold weather may be causing it to lose connection till it warms up took they're advice and haven't had an issue today (I couldn't drive 10 feet without a hot engine before) so I believe that was my problem
I had checked the contact before but was free of corrosion and seemed snug so didn't think much of it
Figured I'd post the resolution in case someone else has the same issue before they dump any money into it like I did
And again thanks for the advice

 

Lil dielectric grease on the connection probably wouldn't hurt

 

Haha way ahead of you it wasn't making connection because the contacts on the female side had spread over time apparently.
Just enough to cause one more temperature drop headache on an old diesel