Here we go again, WHAT SPARK PLUGS

blackjax said

Champion N11YC gapped at .036 you wont ever use another plug hard to find at the auto part store but well worth the 1 day wait to get them i got this tip from another poster decided to give them a try big change in throttle respose on my 318.......im sold!

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so, do you have a radio in your car?

it's a non resistor plug that is one step colder than a stock plug.
resistor in the plug eliminates radio noise that is transmitted to the electrical system every time it fires.

so you must of had to hot of a plug or the wrong gap. I'm guessing.