I have a evo .46 engine that is act a little funny I think im to rich on the L needle setting , the problem is that if i set at idle for over a min and try to go WOT it will bogg and slowly rev up till it cleans it self out than run fine at WOT, but than when I am at WOT and move the stick back to idle it slowly drops rpms till it get back to idle about 30 sec for WOT to Idle Any thoughts