If you hear air puffing out there are only a few things it could be as what you are hearing is compression escaping when the piston is heading towards TDC.
Spark plug, is it in securely? This is a best case scenario. More likely a cracked cylinder wall or something like that. Either way I'd shop for a used motor.
J
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John or J.J. - But I answer to most anything~
*2000 Honda Accord 4DR V6 - 220K*
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