misfiring!

I went out today and everything is okay until my bike started misfiring. I thought my bike is overheating but the temp is just in the lower 1/2 range. I had to pull over and I removed my plugs but it looks okay. I started it and everything is fine but after half an hour of riding when the temp needle is a little more than the half way mark it started to misfire again. The bike had to be rested for 10 to 15 mins and then it would run fine again... do you think its my spark plugs? need help pls.

maybe fuel tank venting - check the little rubber under the cap to be sure the hole is aligned with the breather hole in the underside of the cap assembly.

I've experienced the fuel tank venting problem but it never misfired it just died and I had to have it towed 2 times till I figured out all I needed to do was modify that little rubber stopper so it would aling properly. Previous 99 M750