Added a filter? might want to check your filter....make sure you can blow through it.....I had a filter that was partially blocked once......
As far as the engine goes...did you tune for max then richen 1/4 turn or so.....Hot and humid is not friendly to engines or airplanes...as the air is less dense and the moisture...well were not dealing with submarines here...LOL....fly around at 1/2 throttle.....see what happens..Good Luck