Engine Wont idle and light backfire

[Darius88]

I have a 1990 5.0 ho that won't idle for nothing and keeps lightly backfiring . It has new plugs,wires,injectors,distributor cap and rotor,fuel pump . The engine is slightly modded with e303 cam upgraded rocker arms and bored .40 over. I have messed around with the distributor and found good spot that itll run in but the throttle has to be held open for it to keep running. Currently the throttle cable isn't hooked up. I have to remove the egr block so it will not hit my tall valve covers.
I will try to post a video, but it's being a paiin and saying every file is too big

 

[AeroCoupe]

Have you pulled codes and done a base idle reset? Have you done any other trouble shooting like checking the TPS voltage with the throttle body closed and checked the voltage as the throttle is opened to WOT?

 

[Darius88]

I have pulled codes the only one is just a egr code. I'm new to obd 1 and do not know how to preform base idle reset but I will look into it

 

[General karthief]

Help me create the "Surging Idle Checklist"

Updated 05 July 2022 to add rough idle when cold and smooth idle when up to normal operating temperature. See the EGR tech information, section #15 for more help. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank...

www.stangnet.com

This will show you how to identify idle/stall issues by checking things in order, don't jump around, do the steps one by one, you may have more than one issue I suspect. Fallow the steps even if you've replaced the part, lots of junk on the market now.