I have a 1985 Ford Mustang GT , Stock from day #1 ya 36 years old.
I have had an issue with high Idle 1100 (Stock Carb Motorcraft / Holley)
It has no curb idle adjustment.
Its been running high for about 10 years, Only 65,000 miles on it.
I had it rebuilt this year, but it is still high!
I can add a return spring and it pulls the linkage back a bit further back, but this isn't this issue, just a quick fix.
Any help would be great?
Everywhere I look it says the Carb has no adjustment
Runs...

1985 Ford Mustang Stock (High Idle issue)