By shot-gun I'm refering to replacement without testing and yes, all three should be shot-gunned.

If you can replace the sparkplugs, you can shot-gun these connectors. Testing/evaluating is more difficult. The logic behind shot-gunning these connectors is largely based upon the concept that testing is more expensive than the replacement unless one can do the testing one's self.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician