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Vacuum Problem?

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2003 KLX 400 R. Will not run at idle, must choke to start,and popping on decel. Removed and cleaned jets and passages of carb at least 3 times in the last 2 weeks. The only change I've made to the bike from stock is the installation of a Twin Air filter. Plug is new--since it was replaced the last time I put it back together. Since I knew carb was clean, I started to look for air/vacuum leaks. I used some vacuum block -offs and eliminated the first, upstream vaccum hose . The bike amazingly started right up and runs good--steady idle, no decel popping, and will start repeatedly with no choke (haven't taken it offroad yet). The problem is--the vacuum hose, diaphragm, and o ring all look good. Where should I look or what else should I do to fix the problem. Thank you.

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I tried to blow air through hose (wrong direction?) and I couldn't with the other end blocked off. Hose visually appears to be in good condition. Thanks for the reply.

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I would try a new piece of hose. Since by eliminating it, the bike ran good, you fund the issue. Perhaps it has stiffened or stretched at the atttaching nipples, therby not sealing

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