missfiring with climate control on

well here I am going along the motor way at 120kms per, out side air temp 40c so switched on the air con, first thing that happened was the car almost stopped, it popped and banged and did everything to give me a bad day and being on the outside lane you can guess the fun I had trying to get some power back into the car, anyway I switched of the a/c and low and behold after a second or two all power came back, so I decided to bake in the car until I go home.

My car is a zs120 1.8 engine was changed some 10k ago because of a head gasket everything has been changed and checked, all ok, can anybody give me some ideas what next can I do. by the way the codes that came up were as follows. P0650, P0420, P1316, P0170, P0300. that should keep you wonderful people going for a while Lol. any help would be gratefully received

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