Originally Posted by Doug Stirling
Sorry Stu I know that you are busy.....BUT do you mean:
a. CORRECT = I HAVE got that wrong.
Or:
b. CORRECT = ECU screw is for adjusting idle mixture only.

Correct, you got it wrong Dougie
The Screw on the ecu is whats known as a "Global Modifier" It adds a percentage to the fuel map.