I was expecting a credit card where you can earn money to buy a mower with. :laughing:
Worn dampers on a Z mower can cause erratic operation, especially at low speeds, and they're pretty inexpensive and easy to install. I replaced the ones on my Exmark because it was getting a bit jerky and hard to control...not sure that's the same as bucking.
How many hours on the machine? When was the last time the hydro fluid and filters were changed? How's the hydro belt? Is the oil reservoir at the proper level?