Im not sure where to post this....

But when im driving down the highway at a decent speed and i let off the gas my car fills up with exhaust fumes...sometimes after a while it will fill up with exhaust even when im not slowing down... my rear hatch motor is broken and doesnt pull the hatch all the way down but i looked and it seemed like it was still sealing pretty well....the inside will fill up with exhaust pretty quick too....anyone got any ideas what this is?

 

This could be a exhaust leak from inside the engine bay area.my car smells like exhaust too and i pin pointed the leak to right after the header you should check it out to see if you have a leak around there.my rear hatch also does not go down but i have not been able to fix it yet so i cant help you with that im sorry,hope this was some help atleast

 

there's you answer.
fix it.. and the fumes will go away.