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I have replaced my oem carb with one that says its oem replacement (brand new). The problem I'm having is at idle it sounds like its sputtering like it wants to die out but when I'm on the throttle its running great. When I barley put my hand over the air filter hole it completely dies out. I have tried playing with the air screw adjusting it to the 2 1/4 turns out like the manual says and its still having the same problems. Can anyone point me in the right direction to help solve the problem. Now I bought a new one cause my old oem carb the idle screw on my original carb kept backing out. Please can someone help me I'm at my wits end at this point. Please help please

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