Join Date: Dec 2008
Location: Tyler, TX
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There are a number of possible causes, you may have more than one, or something unusual that I do not mention...
Sticking EBP (Exhaust Back Pressure) valve.
Normal injector wear.
Old oil (changing the oil with a GOOD QUALITY Diesel oil fixes a lot of cold running problems).
Bad glow plug(s), this is unusual, they are normally good for the life of the vehicle.
Bad glow plug relay - not allowing full voltage to the GPs, so they don't get as hot as they should.
Air in the fuel - possible, but does not fit your symptoms exactly.
Sensor problem - if some sensors do not work properly, you can have odd running problems.
Bad electrical connection at battery, fuse(s), anywhere that affects the engine computer.
These are some of the things I would look at first.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!