WE JUST PURCHASED JD 755. TRACTOR WILL START BUT ACTS LIKE ONLY RUNNING ONE 1 CYLINDER. SHAKES TERRIBLE, AFTER 2 TO 3 MINUTES PICKES UP OTHER CYLINDERS AND RUNS GOOD. CHECKED FILTER, FUEL LIFT PUMP TO INJ PUMP.GOOD FUEL FLOW TO INJECTION PUMP. ALSO NO THROTTLE RESPONSE TIL PICKES UP OTHER...