I was also thinking map sensor, as others been done, but best not assume that because they are new they work ok, best get metre out and do some measurements.
If the map is reading wrongly it will be more suceptible to weaker mixtures the warmer it is.
I would also check the fuel pressure, the air temp sensor is a little trim, the main corrective is the CTS, so have a good check on the actual received signal, and wiring etc.
tabetha