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Check all your intake-hoses and clamps. Sounds like you've got a big leak somewhere. What happens is air flows past your AFM first and gets measured. Then if it leaks out somewhere along the way because of a loose hose clamp or a rip in one of the rubber intake-hoses, that measured air escapes. However, the DME computer THINKS more air is flowing into the engine than actual and meters appropriate amounts of fuel. But you'll end up with too much fuel and results in stumbling (because of the escaping air doesn't flow into engine).
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