So i am supposed to take a 250 mile trip home in a few hours. this morning the check engine light on my 2001 ml 320 came on and normally i know this is a minor problem, if a problem at all. however i also noticed that it definitely took a bit more RPM than usual when accelerating from 30-50. the car already has a service appointment at home this tuesday, i just want to make sure i will be safe for the 250 mile trip home...thanks in advance