Mercury Grand Marquis Questions

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It never goes on when you start the car. The car is running fine aside from this problem.
Will not blow through other vents only floor and defrost windshield. Need help please
How long have you had this problem? Few weeks
When I shift the car to R the doors lock automatically, but when I shift to P they won't unlock automatically. Why??
How long have you had this problem? Hadn't noticed it.
Dropped the evac canister under the tank and blew through it. Clear!
When I add air into the outlet hose off the canister I get some air pressure coming back out. Some air does come out the vent at the filler neck but it isn't clear. there is a restriction of some sort but the vent line except for some small pieces of hose is steel. Put som airtank pressure to it but didn't help.
Any other ideas besides dropping the tank and replacing everything.
What seems to make the problem better or worse? Problem just started a week ago. Figured the stations evap hose was messed up.
Every so often my engine light starts flashing and the code reads misfire on cylinder 4, I remove the spark plug wire boot and there's water all around it and inside it, I dry it off, take the spark plug out, turn the car over to clear the cylinder of the water that is falling down in the cylinder from taking the spark plug out, clean it, dry it, put it back in, put the boot back on, clear the code and it's back to normal until it gets water back in it somehow?
What seems to make the problem better or worse? It's whenever water gets in it
How long have you had this problem? A few months
Loud bang when it fell, car was in forward motion (parking lot). Crawled to a parking spot, with that part dragging, still attached. Someone assisted by getting underneath and securing it with a random piece of wire for quick fix. Did not have to drive far, to get home. What is it and what to do?
How long have you had this problem? Just happened last night.
All of my lights go off then come on ,off again on again and so on. This problem started 9 days ago first it was the head lights and in cluster now it's all lights what is my problem how do I fix it
changed from airbags to shocks why?
How long have you had this problem? 24hours
want to know if they are on recall
Light goes off when I stop. Acceleration is good until I get to 45 mph. No odd sounds occur.
How long have you had this problem? 1 day
Ford grand Marquis 2006 ls the gas gauge don't work it's stuck on full I'm trying to check if it's the fuse or something please tell me iv been stranded alot cause of this ?
Not losing engine power
miss fireng #4 replaced all plugs and coil on #4 now it shows that #5 is miss firing do you think it in the compture
just once was driving car then car made sudden stall out and battery cable was sparking.. wont let us hook up cable or it sparks
Clicking noise coming from the sillenod​ engine will not turn or start
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