Just about fed up with this idle.
88 300 has idle surge when you first start it
Eventually it'll stall out. But after it warms up it'll idle steady.
I've cleaned the throttle body. New iac, and tps.

Only code I have is code 67. And that because I bypassed the clutch switch

 

Have you try a different throttle body ? You may have wear in the throttle body plate !

 

I haven't but that's a good idea. Worth a shot at least

 

Swapped out the throttle body
And so far the idle is much better!