Fuel / Trouble starting

[TonyThompson229]

I’ve got a 1995 GMC Sierra 5.7L. I was at the gas station yesterday and as I turned the key, the starter was engaging and doing its thing however it wouldn’t turn over. You can hear the truck trying to start yet you have to give it gas (pressure on the accelerator) in order for it to fire up. After getting the engine to run, it has a rough idle. I can hear the fuel pump whine/hum, and I’m getting fuel pressure through the fuel filter. I have also recently replaced the distributor and spark plugs recently. 
 

Any ideas, tips, or pointers?

Edited June 26, 2021 by TonyThompson229

[HoosierZ]

It could be the Idle Air Control Valve (IAC). It is a stepper motor that controls the idle speed by regulating airflow through the throttle body. On my ‘94, I had a bad IAC valve cause a similar situation. Engine turned over fine but wouldn’t start. Pushed down slightly on the gas pedal and it fired up but idled roughy until it warmed up. Replaced the IAC and all was good. 

[TonyThompson229]

I’ll give it a try and see what happens