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Previously I was having misfires at low RPMs so I change all the spark plugs on my 2005 Yamaha R6. After I changed them the misfires went away but now when I get it up to 80 to 90mph it stops accelerating and sometime would shut off the engine. Could this be due to a loose spark plug or could I be having bigger issues. I will go through and tighten them tomorrow but just wanted to get a second opinion. Thank you for your help.
 

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Test ignition coils. Check for stored codes. Could be vacuum leak. Read vacuum to be sure. Otherwise you'll need to check for fouled plugs. If the plugs are fouled, you'll need to tweak AFR.
 
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