Pinch test is done at WOT, engine speeds up as it leans and if I continued would die. Thought this was standard procedure. Idle is fine, slight stumble from idle to WOT when the stick is slammed. Other wise smooth transition. Planes all fly fine, problem is noted when moving the throttle up during fligh, no noticeable difference in speed/climb/our performance. No decrease though either. I don't have a tach, so this is the way I was tuaght.