1988 Silverado dies after 5 min

[landi250r]

New to the site....great info.

I have a problem with my 1988 silverado 5.7

I recently did a tune up on it including: plugs, wire, cap, rotor, and fuel filter.

I made the bone head mistake and twisted the steel braided fuel line when I put the fuel filter on. Then when I started it, of course with out knowingwhat I had done, it ran like crap. I replaced the fuel line and started it up. The truck ran awsome for aobut 5 min. After that is chugged and died. Started it back up and it started but I have to keep the gas pushed otherwise it dies. It seems to run great as long as the gas is pressed, otherwise it dies

What i have done:
replaced the fuel filter...again
checked the fireing order
taken apart and cleaned the throttle body

What I think it could be
fuel pump
fuel preasure regulator

Hopefully someone can help
Thanks in advance
Jon

[04sierracrewcab]

Welcome to the site!

How many miles are on the pickup?

[ct9a]

Welcome to the site!

I'm guessing that it is a fuel pressure problem. You may have done damage to something from backing up the fuel flow (I'm thinking pump). Good luck.

[landi250r]

Thanks

The od says 251,000 but I am pretty sure that the motor has been replaced seems how I dont think that the truck came stock with steel braided fuel lines.

One thing I did notice is that after 5 min the fuel begins to spudder out of the injectors.

One thing that I diont understand is that if I keep my foot on the pedal right above idle, it runs great. Its only when I try to let it idle is when I have the problem. If it was the fuel pump, would that happen? Seems more like the preasure regulator would cause this result, anyone know?