Boomer

Ok I have 2014 spark with around 160k miles. I have a issue I need help with.  Start up cold drives like a new one no issues. After reaching operating temperature it goes down hill. At this time if I get it driving does good but after stopping it won't take fuel back. I can floor it and nothing forever. First thought was throttle or accelerator sensor.  Hooked up scan tool and did a sweep on the sensors and they work fine. Revs fine in neutral as well.  Also no engine codes.  Got a p0700 one time but it was after it messed up a bunch and was it had been revved and dropped in gear to get out of road.  Think that code is irrelevant because it's a vague transmission code. Any help would be great!