Hi, thanks for your help, cant find any info on this at all... Yeh Ive adjusted that screw all the way in, lowest rpm achieved was 785-800rpm.
Wanted to see how idle was at spec setting of 650 plus or minus a few...
Checked for air leaks, cleaned IAC, cleaned air flow reg, checked for leaks at every possible connection or gasket,
It is running good at the moment, just wondering if there was a simple reason for not having this idle screw on the ecu. Mine is a series 2, 1996 r33 rb25det Not sure if you knew roughly when they stopped the idle screw thingy...
Anyway, thanks again