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this is my first ford car... I have been part of an import family and gm buying household since my very first car.. I have a 98 Mustang v6 and I love it.... But recently I replaced my radiator the spark plugs and the cam shift synchronizer now my car bucks when I hit the gas... It pauses then bucks then goes the redoes this whole process for second and third gear. Did I mess up the synchronizer and throw it out of time are my spark plug wires old?? I hadn't replaced them yet, or is the engine dying??