After tightening my carb (Weber) attachment nuts I noticed my idle would not return to 850 anymore...it would idle higher. I sprayed carb cleaner on the gasket and I definately have a leak on the back (firewall) side. I'm not sure if I've warped the base of the carb or not. I have adjusted the nuts to the point where the idle now comes back down (although it takes longer). When I spray carb cleaner right by the carb linkage it still decreases the idle but does not seem to anywhere else (it also seems there is a cutout in the heat shield there so maybe my heat shield gasket is leaking). My question is.....if i take the carb off can I file down the base somewhat if its warped on one side? Also, when I originally put the carb on I did not use any gasket sealer...either on the heat shield gasket or the thick carb gasket/spacer(with plastic eyelets). When I redo it should I use some......might that help?