08-18-2013, 11:37 AM
Had the same problem, 1996 454XL's in 29 Open. Slight rattle at rear of port engine at idle, my problem was a miss in the in the ignition system. Did a complete tune-up, still there. It wound up being the distributor, new one, problem gone! Apparently when rpm's increased, and distributor advanced, miss disappeared.


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