I have a 1985 Iroc 305 tpi and it has an idling issue it sputters and wants to stall out unless I'm on the gas pedal.. I've checked the timing, all 8 fuel injectors are reading a even 15 ohms. I replaced the fuel pump and filter spark plugs and wires. I've inspected the distributor cap and rotor I've searched everywhere for a vacuum leak and nothing is turning up. Any thoughts?

 

Fuel pressure and idle air control valve

 

Here's how to check IAC

 

Thanks a lot! I will check it today and see.. Also no chance of it being a bad egr? I just pulled it and it was stuck open.. I've managed to clean and free some debris and it seems to be moving up and down now

 

Chances are that the huge vacuum leak created by the stuck EGR was the majority of the problem.

 

[QUOTE=Vader;6021789]Chances are that the huge vacuum leak created by the stuck EGR was the majority of the problem.[/QUOTE

Yeah just not sure as to if I should re use this egr or scrap it.. Hmmm 🤔

 

[QUOTE=IROC AND ROLL;6021949]And also I checked the tps at closed throttle it's not giving a reading (should be reading around 0.45 if I'm not mistaken) when I advance it a touch it says 0.80 nothing showing after that.. However it has a steady climb to 4.45 wot with no mishaps

 

Vader has it about a vacuum big vacuum leak. Check the hoses at the front of the manifold to the rocker cover and to the Carbon canister. They may be rotted out.

 

[QUOTE=IROC AND ROLL;6021950]
It should be .54volts........=bad TPS