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Hi everyone how are you.I have a 2007 yamaha grizzly 700efi .One day out of nowhere my atv started to run really rough.turns over fine but i need to press the throttle for it to start and hold it here and there so the atv does not stall out.it does not stay idling.its really choppy at low revs and as i press the throttle it gets better almost normal in high revs.i have the original exhaust and i drilled out the baffle in it for better flow and i also installed a stealth exhaust.stealth exhaust is a extra exhaust and it acts like a silencer.i also noticed lots of black smoke coming out the exhaust. i had this set up for 3-4 years with out a problem till about a year ago. i tried lot of things like: new spark plugs,different spark plugs,new k&n filter,ignition coil,adjusted the valve clearance,swapped ecu,checked all fuses,took stealth exhaust off,drained old gas and put new gas in,and so far had no luck the atv is not showing any error codes.if anyone can help that would be great,thank you.