Just curious. My buddy has a old 93 or 94 GTX. Ski starts fine, drives fine, untill you go to excel. It seems as if the ignition is being interrupted, as if it is on a 2 step. Carbs just been done, it is not sounding like a gas issue. Any thing I should tell him to look into for a fix ? Pretty sure the ski has the security system tether and what not. Could it be that is the culprit ? Any info would be great. Thanks