got a P1299 OBD II code-head overtemp sensor-on my 2002 Honda S2000, what to do?

What is your question?

also got a P300, 301, and 303 misfire codes, assuming the gas treatment and fresh gas I'm going to try doesn't clear this, what next?? I drive it infrequently, but make sure gas is treated with Stabil if its going to be in the little beast over 30 days.