Likely the fuel filter is clogged so you need to change it. If you can keep the engine running by pumping throttle a few times at start up, and then it runs, check the filter; cost about $10.00. On My 1999 Mercury Grand Marquis I had to replace the Idle air control valve because it did stay running until it was warm
Replace your IAC Valve-No more stalling
check your idle air control valve
I experienced a problem with a 84 Grand Marquis that would stall at stops. Found that the ignition switch in the steering column had separated that caused the stalling problem. Replaced the ignition switch that solved the problem.
yes it Can I suggest you take the filter out and clean it thoroughly or buy another
Faulty ECT (engine coolant temperature) sensor. Replace it.
Alternator fails to supply power.
CHECK IDLE CONTROL VALVE, I REPLACED COST 80 DOLLARS ONLY TWO SCREWS,WORKED FOR ME
What year is it? it could be the coil, the coil will break down when it gets hot. And then be Ok after it cools off.
does my 1996 pontiac ga stall out in park
in a stall
Your Mercury Cougar might stall in reverse because of a problem with a bad crank sensor. This problem could also be due to the crank sensor wires which are damaged or not wired correctly.
try cleaning the throttle body