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Hello, I have an 86' 200SX. Customer brought it in with rusty dry gas tank and said it ran good, but would not idle. I cleaned the carb, completely cleaned and coated the inside of the tank with fuel tank kit. Came out great. Fresh fuel and Cleaned carb, adjusted valves. The bike will run great all day long as long as you don't let it idle. It will idle very high, then slow to a low idle for a few seconds and then backfire and die. I replaced carb with a brand new one, still does the same thing. Sealed off the air box with no improvement. Sprayed the intake manifold with carb cleaner while running and it did rev up the rpms. So I removed it and coated it good with some Flex Seal (just to test if it would help) After reinstalling the it, It still does the same thing. Any Ideas of what else could cause this problem if it is not the Intake manifold? I'm running out of options. I also replaced the O-Ring on the Intake.