There is most likely a problem with the throttle plate on the carburetor. It is not closing all the way when your foot is off the pedal because the throttle linkage is out of adjustment or the spring which holds the throttle plate closed is either weak, broken or missing entirely. You can check this yourself. With your cart in neutral or the rear wheels off the ground, slowly depress the pedal with your hand while watching the throttle plate shaft. The starter motor should start before you see any movement in the throttle plate shaft. If the throttle plate starts to open before the starter motor starts you have found your problem and you need to loosen your throttle linkage or replace the weak or missing spring. I had the same issue with an older (1987) EZGo. Replaced the spring with a couple of ball point pen springs meshed together. Problem fixed!
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