Recharged a/c. Why'd engine start overheating on hot days w/intermitent missing

What is your question?

Intermittent missing has been occurring since a/c was recharged. It occurs whether a/c is on or off. Overheating only occurs when a/c is on, and I have only tried using the a/c in 90 degree or higher weather, so I don't know if it occurs when it is cooler outside.