Question about 1999 Pontiac Grand Prix

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(1999 pontiac grand prix 3100 v6 engine) my engine vibrates while idling and I can hear and feel it while sitting in the car, I need to make sure my plugs are in correctly and my wires are in the right order. I need a diagram of the firing order. All help is greatly appreciated.

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(1999 pontiac grand prix 3100 v6 engine) my engine - 69c3ea4.png
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Here you go good luck to you.

Posted on May 20, 2011

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If there no malfunction or firing or kind of shooting while the car its runnig on the road spark plug should be ok you also can check the sparkplug by having the car runnig on idle and 1 by1 take every spark plug wire out when you are taking 1 by 1 out the engine should make a diferrent movement or sound different or start shakin mopre or less, ( like bady movement) if so with all the sparkplugs thats mean they are ok if when you take 1 out and doesnot do any thing that one its not working. good luck

Posted on May 20, 2011

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