I just got thru changing the plugs I found that someone had changed 4 of them the other two were still originals.119k miles. Who in there right mind would not have changed all of them when they had it apart? May be a dealer ?

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.