When it is cooler out the throttle has been fine, it only started acting up after the third flight.  It didnt quit, just didnt throttle up 100% right away as I was used to.  The only time it quits when throttling up is when I first start it for the day. If I let it idle for a minute, then its fine the rest of the day.  It used to quit if I idled too long and throttled up, especially when landing, then I turned the low speed in an 1/8th and its been fine ever since.