New here need some help please

[Phoenix]

Hello nice to meet all of you here's what I've got 1994 Yukon 2 door 5.7 TBI auto trans 4x4 wanted one for a long time and just bought this one a month or so ago was my dream truck but has become my nightmare when cold she cranks idles fine untill warm up and then dies will start right back up but dies after a few sec but if I put my foot on the gas and hold it at 900 rpms she runs like a top and drives great but as soon as I let her idle down she dies I've replaced (with new parts) in this order the sparkplugs, wires, cap, rotor, deleted the cat put headers on it then the PCV, IAC, TPS, Ignition Module, Coolant temp sensor sprayed carb cleaner around the TBI uint and still she has not changed at all but does run better then when I got her just dies HELP ME PLEASE!!!!

 

[jrplz]

Hello nice to meet all of you here's what I've got 1994 Yukon 2 door 5.7 TBI auto trans 4x4 wanted one for a long time and just bought this one a month or so ago was my dream truck but has become my nightmare when cold she cranks idles fine untill warm up and then dies will start right back up but dies after a few sec but if I put my foot on the gas and hold it at 900 rpms she runs like a top and drives great but as soon as I let her idle down she dies I've replaced (with new parts) in this order the sparkplugs, wires, cap, rotor, deleted the cat put headers on it then the PCV, IAC, TPS, Ignition Module, Coolant temp sensor sprayed carb cleaner around the TBI uint and still she has not changed at all but does run better then when I got her just dies HELP ME PLEASE!!!!

Welcome to the forum, Start with checking the fuel pressure on your truck . IMO it sound like your fuel pump is going out

 

[Phoenix]

fuel press is 60psi untill it dies but I did buy a new fuel pump and filter today anyway