Car stalling any advice appreciated

Update: New ECU, car runs drives and idles decent. The initial start up there was a lot of white smoke and hesitation but after flushing the block and fuel lines it's doing fine now. There is still a slight miss and dies at an idle but I think there still may be an overheating issue. The single yellow wire from the temp sensor is broken so will need to either resolder that back on or get a temp gun for accurate temp readings. Not really sure what is causing the miss at the moment but no new codes have shown. The exaust still smells rich and the oil has a slight smell of gas but nothing like it was before.