Why is my car losing power? Is it "stalling" if it stays on with no power?

What is your question?

transmission just rebuilt at 140k(4 hrs away from home) and it made it home fine, but is now losing all power(ability to accelerate) after driving a half mile or less from the house. It started to lose power to accelerate on the highway a couple years ago on road trips and i knew it was cause something was overheating. now i hear it needs a transmission cooler. so ridiculous. it also used all the darn oil last year and i have to check it all the time now when it gets warm. I have read about previous crankshaft and camshaft sensors that could be to blame but I dont know if my car is considered to be "stalling" when it loses acceleration. Is there a specific sensor that is most probably causing this? Seems that maybe a PCM sensor is probably to blame but can i fix it from home?(mass air flow is clean as a whistle, plugs are new, and I heard fuel filter is in the tank.) I just spent 3k. Is there something I can do myself or do i have to bend over at the dealership?