240 m2 X20 no go when air warm

[crazylegs]

Hi
Anyone experiencing problems with there 240 m2's
Took the boat on the river the other day and it went fine took it out today on the ocean and no go it will idle and thats it this has been a problem the only difference between the days was today was very hot out and the other day was cold. is there an air temp sensor maybe as this seems to be were the problem is
Tnx