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I had the same problem and it drove me crazy. Turns out i had plugged fuel feeds to the idle jets. No high pressure air will blow it out unless you take the carb off and leaving the jets in but backed out a couple turns high pressure air might work. It did for me. Another time i revved the motor wide open and choke it with a rag or anything choking it to quit instantly. Sounds crazy but it sucked the dirt out. Don't forgget to readjust idle once you restart it.