FastOrange
OBSless
The code can be checked by someone that has an OBD reader. By your dash, I'd say that your truck is OBD1, or OBD1.5 if it's the oddball year. (95?) Most decent shops have this. Some parts stores will read it for free.
Sounds to me like it's running rich when it starts up. Does the exhaust puff a bit of black at start up?
95 was OBD1 and 96 was OBD2 he can use a paper clip to read his since its OBD1