I had the ridiculously high idle problem also and it's a bit of a bear to get a wrench on that screw, but that fixed that. I retorqued the nuts on the studs to a high value and got it to seal. Check to make sure your throttle arm from the pedal isn't hitting the back of the intake at idle. Mine was because I had the throttle linkage maladjusted. I screwed it out a couple of turns and that got it. I am happy with the Summit but I'm hanging on to my 1406, just in case.