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Quote:
Originally Posted by Cape Codder
One test we did I failed to put forward was the fact we grounded each plug.
#4 showed a significant change in idle speed, #3 showed very little change, #2 showed a good change and #1 had NO change.
That was really the reason we have considered changing the plugs which have 6-7 thousand miles on them.
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Change the location of the plugs you have in the car and see if they have the same symptoms in different cylinders.