I have a John Deere LT 180 that runs and cuts great. The thing is that when I take my foot off the forward pedal and press on the reverse pedal the engine sounds as if it want so to momentarily stall out. Either the engine recovers on it's own or releasing the reverse pedal and reapplying the reverse pedal the engine will run normal. Checked the safety switches and wiring but do not see anything. Anyone every have this happen?