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Old 06-23-2009, 02:20 PM
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MCVOLS MCVOLS is offline
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Join Date: Mar 2009
Boat: '08 X14 MCX Slot
Location: Southeast
Posts: 236
Had a similar problem after a tune up. Not as bad as yours sounds, but would backfire under a load. Idle was fine. Re-checked the 'new' plugs, and one was cracked. It got worse as we continued to run, I guess the crack got worse as it heated up. As mentioned, plugs/wires/timing sound like a logical starting spot.
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2008 X-14 MCX
1993 Prostar 205
1982 S&S
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