Yesterday while using my EPS Lazer, I made a turn and as I pushed both levers forward, the mower stumbled and felt like it lost some power. I played around with it in that lawn some more and it felt like it was struggling as you pushed the levers all the way forward. The engine seemed to be bogging down and then trying to catch up. I had also noticed it was having a little trouble discharging grass in some spots. On top of that, when throttling up with no load, you could see some black smoke, like it was running really fat. Never had I noticed that either. I pulled it up on the trailer and hopped off and ran it up to full throttle, no load, and you could see just a whisp of black smoke exiting the exhaust. I probably would have overlooked any one of the problems if it had not done all of them. As I ran it at full throttle, no load, you could here a faint popping in the exhaust, not a backfire or anything just a random pop here and there. No real frequency to it. Kinda pop..pop.......pop......pop.. pop..pop..pop. Sorry, that's the only way I can describe it, LOL Today, the mower seemed to run ok, but the stumble showed up again. Once again, making a turn, it kind of fell on it's face. Anyway, the MIL is only lit brightly before the engine is started. Once running it goes dim. I guess that is normal??? The mower has not picked a very good time to do this, my other ZTR is down too. May have to take the Grasshopper out of mothballs.