I could use a little help troubleshooting my ZTR. I started it on Sunday and it sounded off. I first thought the exhaust manifold gasket was leaking. It seems fine. I then let run a couple minutes like normal before moving/ engaging the PTO. That almost killed the engine. I checked the fuel pump, its feeding the carb. Checked the plugs, both looked good, not wet or black. Checked the deck, all spindles and pulleys turn fine. I took the hydraulic pump belt off, same results. It shows around 800 hrs. but probably has close to double that. I am hoping to find a small item as I am not going to put much money into a 20 year old mower. Any ideas? Thanks Jeff