Ok Ill start off with this yesterday my truck ran perfectly fine drove it home about 45miles last night and it didnt miss a beat that was around 11pm. This morning about 11-12:00 I went out to move my truck and got in turned the key and nothing happened I turned it and I heard a click so I figured a dead batt. I left the key on and popped the hood and I could hear a buzzing/grinding sound kinda sounded like when your batt is dead but has some juice and you start it and it grinds kinda like that. well I went into the garage got the jump pack and when I got back my radio was on and my dinger was going off(it wasnt doing any of that before). so I thought that was kinda weird. Without trying to jump it I turned the key and it was turning over but wouldnt run I tried that a couple times and I said to myself I doubt this will do anything but I held the gas pedal down a little bit it started up but was missing real bad and wont idle. If I can get it to run the rpms go to about 300 then back up to 1,000 but as soon as I take my foot off the gas it dies. Just a few moments ago I got it to idle by itself but as soon as I shut it off and tried it again it was doing the same thing. Could it be tps or map sensor? also for some reason my abs and brake light was on for a little bit when it was running I dont know why my fluid is fine and my parking brake isnt on that was only happening when it was missing real bad and I wasnt giving it much gas.

If you need I can get a vid of it.

 

Anyone have a idea? What are the sensors under the air hat. Im pretty sure the one facing the front of the truck is the map sensor and the one to the right of that(if your standing in the front of the truck) is the tps, correct?

 

Could be many things.

Crank Position Sensor
Coil
Battery (with bad ground)
Bad Cap/Rotor
Bad Starter

When mine did this it was the coil and aftermarket igniton box i had on it MSD 6A... check that, see what it does, i was lucky enough to have a stock Coil laying around to swap it out with.

Have you checked fuel pressure? Is the pump turning on?

Glad to see you guys are getting help here.

 

It seems to have started with it acting like a low or dead battery. Start there. Check the battery voltage and grounds if the voltage is good. Computerized vehicles need a strong electrical system or all kinds of weird stuff starts happening.

 

Batt is fine if anything it might of been ground(would explain the grinding/buzzing sound) but I cranked the truck several times and batt showed no sign of getting weak. I could hear the fuel pump come on every time as of right now my truck is fine it starts right up. Ive noticed a couple of times that if you revved it up after you let off it would go to a low idle for a sec then come back up to where is should be idling. I was told it could be a fuel fliter(not sure where its located i think maybe on top of tank?) I would think if it were fuel fliter it would cut out at higher rpms. Im thinking crank or map sensor maybe tps but I doubt it. It was just weird that it was fine one day then act up the next day and be fine later on in the same day.

 

Fuel filter is a sock in the tank I do believe. I don't think fuel delivery is the problem though. It sounds electrical. I'd check grounds for corrosion or being loose. Thrown any codes? Key on-off, on-off, on, then immediately look at the odometer for codes other than "Pdone" to appear.