just bought my wife a 2000gtp today she liked my 1999 so much she wanted one of her own. well we went and picked it up 121k on the motor and trans. no issues other than a few blemishes visually.... well drove it about 120 miles home and to and from the car wash and everything was great. about an hour later we go to take it to dinner and its sputtering and sounds like its tapping. im wondering if it probably a bad coil or somehow something happend to the motor in 130 miles. no check engine lights but i havent had a chance to scan for codes :/......... any help would be greatly appriciated thanks in advance