it is not uncommon for mechanics to intentionally alter something so you come back to spend more $ or just alter something by mistake while doing oil change --- i had a place drain all oil out while doing spark plug change because they were only place that sold those engines or rebuilt them in that area & so my engine seized/blew before i ever got home (bone dry on oil) & no way to prove they did anything....
here are the things to check & remember it could have been simple mistake (especially if a discount oil change place because they are not that skilled or smart) & it could have been just coincidence:
check all fluid levels
check all spark plug wires (that is my bet someone loosed one by accident)
check gas fuel line (just that there are no leaks or any picnches in line)
with engine NOT running just look at it and feel if anything at all seems odd or loose - even if you are not mechanical, often most people can discern if something is unhooked or loose.
If it started after you have the oil changed , you might want to check and make sure that they didn't knock off a spark plug wire or a vaccum hose, You could have a clogged fuel filter are your (TP) sensor is bad.