04 g35 coupes been shutting off while slowing down or at stops for a while now first I cleaned the throttle body and maf sensor and was good for some months then it shut off again and got a code for o2 sensors and camshaft sensors switched both some time later car shutoff again while slowing down now got p1283 and p1281 a shop is saying it could be cats or ecm ecu but idk

Did you replace the cam sensors with genuine OEM Nissan or Hitachi sensors?

P1283 and P1281 are both for the bank 2 upstream sensor, not the downstream sensor mounted in the cats. Which sensors did you switch, the upstream ones in the headers or the downstream ones in the cats?

switched the upstream sensors with oem
also when I drive especially in hot weather I feel heat coming from the center console area. I’m just lost because I’ve gone to so many shops and none have been able to figure it out

I'd just take the cats off for a visual inspection. If they're bad you can usually see melted spots on them when you look up the pipe, one end has a bend on it so you will need to use an inspection mirror or a borescope.

The thing about that code P1281 though the O2 sensor, it's supposed to cycle and that code is saying it's not doing that. The other code P1283 is saying it's a lean condition, so it might not be the O2 sensor causing the issue.

I would pull and inspect all the plugs, keep track of which cylinder they're in, see if one of them is a different color, particularly on bank2 where you're having these issues. Might be a bad injector that's not spraying enough fuel in one cylinder, might be an intake leak affecting bank2, might be an exhaust leak at the header-engine gasket on bank2.

You can smoke test the intake and exhaust to check for leaks.

replaced alternator and been driving all day yesterday and today problem seemed to go away

Fingers crossed that it's fixed