Been there, done that! I put a bottle of Syn. Formula 1 injector fluid in all my cars and never have any lag. Approx. every 4th, 5th tank!
P.S. If its real bad, put full bottle in a half of a tank and drive the car hard. 2nd tank fill with another bottle. 3rd tank:replace fuel filter! 4th, 5th, 6th and even 7th tank enjoy your car and feel proud of the pwwwwwwwwwr!
