Fuel pressure

[riverbanks]

Coolant temperature sensor for the pcm to Know how cold it is for cold start

[Matthew1989]

Ahh okay I gotcha. I never would've thought of that. The truck is actually at the shop that put the engine in for me last year right now. As of earlier today he hadn't found anything. So if he doesnt find anything tomorrow I'm going to pick it up after work and I'll do some more tests myself. I guess I should check the fuel pressure on key up after sitting for awhile instead of after driving it 40 miles. 

[riverbanks]

Take the hood off,mount gauge in sight, drive,that is the perfect way,hey,read that obd2stuff, good insight

[txab]

Doesn't '03 have an underhood fuel pressure regulator? If so check it also

[Matthew1989]

Yeah it has the vacuum operated regulator, I checked it before by pulling the vacuum hose off. But I haven't checked it here lately, i read on another forum that a guy had a bad regulator and the vacuum line was dry but once he keyed up the engine it poured fuel... so I'll try that when i get the truck back