SOLVED! 318 2500-3000 rpm idling issue. Don't think its a regular vacuum leak. Swapped 2 intakes, 2 carbs ,and 6 different gaskets still no luck.

Keep working guys all good answers.

Being nobody has been able to pin down the answer yet, will ask AI (artificial intelligence) to chine in.
__________

A Dodge 318 idling at 2500 RPM is typically caused by a vacuum leak or an issue with the carburetor or ignition system.

• Vacuum Leaks: This is the most common cause, where unmetered air enters the intake manifold, creating a lean condition that raises idle speed.

Here is another interesting take:

Ignition Timing: Incorrect timing settings, specifically a lack of proper mechanical advance return or a stuck distributor spring, can prevent the timing from retarding to idle speed.

_________

Now here is the question:

What is consistent with all the tests and all the parts the OP has switched out during his Process of Elimination diagnostics.

Answer:

It's the same lame DUI converted mopar distributor with what ever the mechanical advance situation is, in use, stuck, or gone...

_________

Tear it apart guys.


☆☆☆☆☆