I have a 300ci 90 F150 E4OD, sometimes I will drive my truck just a few miles (not enough to completely warm-up the engine) and then turn it off while I run inside my house for a few minutes. When I come back and start up my truck, it studders a lot when I accelerate for the FIRST time only. It seems like the engine is flooded or something because it struggles through 1st gear and part of 2nd gear. I just hold the gas pedal down with a constant pressure. Then, all of the sudden, it revs up like it nothing is wrong. This only happens when the truck has been sitting for less than 30 minutes and is partially warmed-up. I think it is maybe flooding or bad spark plugs. Thoughts??

 

I do not know if the Ford Trucks have a Fuel Pressure Regulator or not, but your problem sounds like a problem that I had in a car I have. That Fuel Pressure Regulator had a tiny hole in the diaphram, allowing fuel to leak through, and in the short term it acted as though it was flooded (which it was), and long term it was slightly hard to start, after it was cooled down.

 

I have never had a problem starting. How can I check the fuel pressure regulator??

 

I removed the post to make a correction. The post following is the post as I had intended.

 

The dealer found the problem, after 210,000 miles. I had complained at least every other time I took it in for service, so they had a lot of times to find the problem. The only way I would know to check it, would be to replace it (I still don't know if Fords use a fuel pressure regulator or not, though it would seem that they do).

My car usually started fine cold, but after it had warmed up at least a little, if I shut it off, I would have to start cranking it, and then press down on the accelerator until it would start (this was an inconvenience for others, but I had gotten used to it). It is a fuel injected Mercedes Benz, and it should have started by just cranking it over, and it is considered a no/no to press on the accelerator until the engine is running.

When it was in the shop, one of the mechanics asked the mechanic working on my car to move it because he had to move the car he was working on, and my car was in his way. The mechanic working on my car could not start my car, and the other mechanic tried it and by depressing the accelerator it started, so the mechanic working on my car decided that my car would not leave the shop until he found out why that happened (this after 210,000 miles of the same problem for me). The mechanic tested the pressure of the fuel system, and found that it was not correct, then found the hole in the diaphragm, and replaced the fuel pressure regulator. I was out $250.00, but my car starts like it is supposed to now, and I am happy.

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Yes Fords have a Fuel Pressure Regulator. (FPR)
Theres a Schrader valve on the fuel rail that you use to test.
You should get 50psi at idle.
Disconnect the vacuum line to the FPR. There should be no gas in the vacuum line or the port on the FPR. If there is any, replace the FPR. The Fuel Pressure should have jumped up about 10 psi with the vacuum line off.
Now plug the vaccum line back in and it should return to normal pressure.
Now turn the truck off. The fuel pressure should hold within 5 psi for 30 seconds. If it doesn't, you have a leak somehwhere.

Hope this helps,
Tim

edit - you'll need a fuel pressure tester for this. They run $40+ at the parts stores. See if one store has a loaner program.