TROLLS PERFECT BUT WILL NOT RUN AT FULL THROTTLE.<br /> EVERY 15 SECONDS OR SO, AT FULL THROTTLE,, THE FOURTH CYLINDER KICKS<br />IN FOR A SECOND THEN BACK TO THREE CYLINDERS.<br />I CHANGED THE 4 PLUGS. NO IMPROVEMENT.<br /> IS THERE A HIGH SPEED JET? COULD IT BE PLUGGED? <br /> 99% OF THE...