I have a new OS Speed Spec 2 . Leaning out to race settings and the motor will not go back to idle. Stays on high RPM then eventually goes down? I have taken needles out of carp and cleaned, tried different pipes,lengthened both pressure and feed lines. Took carb out and put back made sure all the way down. Big race in < 2 weeks bought this motor for HP and getting real frustrated at this time. Anybody help?