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to check plugs properly you should be taking a blast down the highway, pull over and shut the motor off clean and look at the plugs.

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and take it out on a deserted stretch of highway (warmed up/choke off), pull over and put in a new plug or 2 in the hottest cyls and disable the accelerator pump and get up to speed as fast as you reasonable can w no AP shot as you dont want to lean it out & skew your readings and hold it at a steady speed for as many miles as you can and What Stanton said cut it clean and coast to the side of the road