I have a 1999 mercury grand marquis. I changed the fuel pump and fuel filter. Change plugs and coils. When i sit in park it runs but when i get on the highway after 45 sec my temp gauge will come on

Asked by May 24, 2015 at 11:56 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

and the car cuts off. Then it cranks
back up n drives after a while. The
check engine light also fades in and
out. My car was running perfect till i
changed the pump. Please help me

4 Answers

7,245

Have a scan to see if anything comes up to start with.

Ok. And could a hear sensor maybe the problem. Cause my temp light cimes on wen.i do like 60 n shuts of

Heat sensor i meant

7,245

The scan would show if it's bad

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