93 f150 mark 3, 5.0 / AOD. Stock except for the cats have been deleted

It wont flash computer codes, CEL stays constant

When it's cold it runs great.. when it is up and warm after 20 minutes or so, the CEL comes on, it stumbles, makes a rattle with throttle, and runs rich. You can smell and see the exhaust,, but only after warm.. ive already replaced the EGR and coolant temp sensor. Also the throttle linkage idle screw is backed out not touching and it still runs high, about 1000 rpm

I just got this and looking in the glove box, I found an old throttle positioning sensor in the box. Apparently it was replaced last year. Looked and sure enough a new one is on there. Knowing a lot of people may not have correctly adjusted it when they installed it, would a TPS be a problem when an engine is warm only?

 

No, the TPS cannot prevent the EEC from flashing codes. It's long, but read this whole page:

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There is no adjustment for the TPS, and the throttle stop screw should NEVER be adjusted. This page explains the process of returning it to the proper position. It should be red-threadlocked in-place and never tampered with again.

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Changing parts is not repair or diagnosis. TEST each suspected part with as little disturbance as possible to avoid creating more problems in the antique wiring.

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I'll get the throttle stop screw back to where it should be and maybe I can track the source.of.my high idle

The TPS waa.changed before I bought it. Out of curiosity I maybe should test the old one to see.if it was even bad

 

Absolutely. And if you suspect a problem inside the EEC, inspect its electrolytic capacitors. It's extremely common at this age for them to leak, causing a WIDE variety of symptoms.

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I have a wrecked 94 that still runs well. It has the same drivetrain (5.0, AOD) the only difference being its a mass air truck. Would its EEC work?

 

No. Not even close.