Stumped need help
 

I have a 92 f150 5.0efi idles great but when i put it in drive or reverse it dies.i put in a new fuel pump filter plugs wires cap rotor transmission and a bunch of sensors

codes?

As Roadie said, is it throwing codes?

Is everything hooked up where it's supposed to be? Vacuum leaks?

stumped
 

no codes

stumped
 

no codes and yea i went through vacume twice and checked all plugs n connections i even sprayed carb cleaner to make sure of no vacume leaks

Check the fuel pressure and also keep the gauge on it when it dies just to make sure you have pressure.

Clean the IAC.

stumped
 

its brand new im mean i replaced everything electrical and fuel wise even the transmission i was woundering if maybe the timing chain is bad but it idles great or maybe valves?? Idk im lost oh yea the overdrive keeps flashing it wont turn on or off . also in park when you hit the gas it has a bad hesitation then clears up if any of that helps

If the overdrive light is flashing take it to a transmission shop and have it checked for transmission codes.

I would still check the fuel pressure. There is a regulator in the line too. Just to rule it out.

Torque convertor staying "locked" will cause the truck to die at idle.

It's like trying to leave a clutch engaged on a manual while sitting still

How many miles on the engine? I've seen them stall like this when they get tired and the timing chain stretches and throws the valve timing off. I don't know if the computer might pick up on that or not but it usually affects the emissions. OTOH the computer could be compensating for the emissions. In the late 60s and early 70s engines, a timing chain was only good for about 60,000 miles.

PS a compression gauge may show it if there's a problem with the valve timing. A vacuum gauge will show it but a lot of other things could also cause an abnormal Vac Gage reading. I would strongly suggest a compression check on all cylinders just to be sure that the pistons and pistons and valves (not valve timing) are physically ok.