M7 wont start!

Well I have already taken it to the dealer but here it is anyways! I buy this M7 got a sweet deal! It runs awesome when I bought it starts up first pull! I get it out to the slopes it runs for 5 mins shuts down kinda smells like plastic burning and wont start again! After a **** load of pulling and pushing on my part I get it back on the trailor and home! I check for spark! Its got lots of spark! I checked for fuel! Its getting fuel! I checked the throttle sensor it seemed to be ok! Then I tried pulling it with like an 1/8th of throttle! It starts up but is running like s#$@! Sounds like its miss firing and stuff! So I take it to the dealer explain whats happening! They hook it up to the diagonostic machine comes back clean! The guy said he checked around and fouind that the ignition timing sensor was out??? And it was putting out more amps or ohms than it should! They said they were going to call Arctic Cat and see what they said! I phoned back today they told me that they arent ordering the sensor cause AC told them to look at some of the wires! Any body out there help me out soo I am not paying these people 90dollars an hour shope rate to look for a needle in a hay stack! Anybody had anything like this happen before?? Thanks

ya I put nw plugs in everything! Just wild man!

would this be something that maybe the shop would know about! this yellow plug what is it for?? Does your sled run with like an 1/8th throttle?? Cause I can get mine to start like that sometimes! The shop said something about ignition timing sensor?? I dont know I just dont want to pay a whole bunch of money but its also hard to tell a problem by just guessing! Thanks for all the help guys I just really want to ride this thing!