My friend dropped off his grizzly to repair because it will crank over and start and almost always immediately stall. Every once in a while it will run and idle for 15 seconds and stall. Sometimes it wont start at all, just turn over. No codes except for the EPS speed sensor, which I don't think is related. I have removed the throttle body and left it connected to check the spray pattern of the injector and it looked good, maybe excessive, but I have nothing to compare it to. I tested the TPS and it was 17&97 - good. I did not test the other sensors on the throttle body, but it would have a code if they were bad, right? I pulled the plug and it looked black and I ordered another, it will be here tomorrow. The spark did look acceptable on the existing one. There is no air filter in the air box, but it should still run. I am going to check the valves and replace the spark plug tomorrow, but am I missing something simple? I am very good at troubleshooting, but this has me thinking. I do have the service manual for the '07 but not the '08 like I have. Any help is GREATLY appreciated! Thanks fellas.