Car turns on then turns right back off
I got an oil change and air filter replacement done
on my car and 2 days later after I would drive it for
a while like 45 minutes it would slow down on it's
own with a dash light that read "engine power
reduced" then completely turn off, I turned it right
back on and it drove fine for a while and it
happened again, it did this for a couple of but only
when I would drive it for a longer distance.
Eventually the distance it would run without turning
off got shorter and now when I turn it on it turns
right off. Any suggestions?