My car dies for only a second at 40mph engine light comes on ac blows hot air

Thanks but I just got a brand new catalytic converter but car still does same thing! Every morn after driving abt 15 min my car feels like it died for just a second n kinda jerks like it gonna stall but I let off gas for sec n it keeps going. Engine light flashes too. I thought it was trans but it only happens if I'm driving a while n only send 40mph. I read the ccrm controls fuel pump n makes a.c. blow hot air n that's my exact problems. Hasn't totally stalled YET!!