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often times the connection inside the plug boot gets corroded and it's almost impossible to remove the wires with out damage. when this happens I gennerally replace the wires anyway this saves you problems in the long run . the sparkplug wire removalk pliers are a good investment however they are only as good if the boots themselves are not siezed up on the plugs. I have had this happen alot over the 20 years i been working on vehicles. I usually just twist and pull on the boots till they come off and not worry about damaging them because they should get replaced anyway the new plug wires have a antiseize lubricant to keep from this happening in the future
I would recommend that you replace the plug wires at the same time
because the boots usually break when you remove them and with the
engine rotated forward they are easier to get at.
When re-installing the new plugs, it is important to make sure you
get several turns on the plug before putting a wrench on it. The last
thing you want to do is cross thread a spark plug. The new plugs should
almost bottom out before requiring a wrench.
Your problem may be a faulty (shorted) ignition coil housing assembly (the white plastic cover housing the coils its bolted to the aluminum cover) change that along with the spark plug boots ( the boots are optional but I recommend it) that should get your Grand Prix running smooth.
Good luck and keep me posted, be glad to help