won't go into passing gear
I'm not too mechanical but whichever gear it's supposed to go to when pressing the accelerator to the floor. When I do, it just bogs down until I let off. Didn't discover this until I was entering the interstate on an on-ramp and needed to speed up quickly to merge with traffic! Bummer!
Search Mercury Grand Marquis Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercury Grand Marquis Experts