I can start the engine fine some times but may stall and then wont restart until i hold the throttle all the way to the floor then fires right up runs a little rough at higher idle then clears out and away we go, very intermittant.
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Sounds like your AIS (Automatic Idle Speed) motor is working sluggishly or intermittent.
Try cleaning the throttle body and/or replacing the AIS motor.
I used to see that a lot working at the dealership
its very important that the throttle body especially around the throttle blade be spotless clean or they will stall every now and then. then progress to refuse to idle at all. take off the rubber air intake pipe from the top of throttle body [has 3 torqes screws] open throtle by hand and look for carbon/grease/soot etc were the throttle sits when closed. clean with toothbrush and some caeb cleaner get all black off and dont forget the blade, both sides and the edges. scrub then rinse with carb cleaner untill shiny.spray some cleaner in the hole that is on top off the body to. that is your idle air controll motor port.put back together.it will be hard to start at first so hold gas pedal half way down untill it starts then slowly [real slow] let foot off untill you are no longer pressing it. put in reverse and let it idle there a few seconds then do the same in drive. that should do it. sometimes it may stall a couple of times when driving dont hold foot on gas just let it die then restart this allows the computer to readjust its idle stratagee
it looks like your engine is having an over rich fuel mixture maybe, thatswhy when you press the pedal to the floor it starts becouse you allow lots of air to help clean the mixture while cranking, also you should have black smoke in the tailpipe until it cleans up and runs fine, i think youre having a leak in one our more injectors you should check them first for proper seal under pressure these is done in an injector test machine, second it may be a defective map sensor these trucks some times have a bad map and dont give a MIL (malfunction indacator lamp) and last but more rare to be is a blocked fuel pressure regulator chek fuel pressure it should be between 38 and 45 psi and it shoul hold these pressure when you turn off the engine if pressure drops fast its injector seal problems or fuel pump check
your crank position sensor is starting to go bad. we see this a lot at the shop, when it gets hot it will short itself out. you will need to replace it before it goes out all the way. it is located on the front of the valve cover or on the pass side rear of the cover and is held it by one bolt. you can get this at your local parts house but I do recommend you use the one from the dealer we seem to have less problems with them.