OK heres what I did I have a dianostics hand unit when pluged in to my std car setup the base line tps is 16.5 so when I fitted the ST200 body its base line is 18 .0 I could of turned the throttle stop screw back to get 16.5 but had no need to as my idel is controled by the throttle bypass valve and ECU and ran fine as is ,ho and a lot of the peps on here have good knowlege give respect gain respect.