Just built my 7MGTE from the oil pum up and installed motor added a new turbo 57trim CT26. Having problem with idle and setting timing . Idles erratic until I partially pinch off the large vacuum hose connected to the Idle Air Control Valve. Ran ok for awhile and now the idle is erratic at partial throttle. Also apparently the turbo air bypass is not working properly. What can I do to troubleshoot this without replacing the Idle air control valve , the cheapest I found is $295 . I have already dumped $6000 into this car and getting very tired of it