1990 Mercury Grand Marquis Questions

All 1990 Mercury Grand Marquis Questions

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when i shift from 3rd to 4th(overdrive) tran slips like putting in neutral. i can start off in 4th but when i reach about 45mpg trans slips and i need to put back in 3rd. i have 89 merc grand marquis. ron56
Stalling or straining when driving. I heard a backfire once but haven't heard it since. I noticed I have a oil leak in my valve cover gasket. What could be causing it to not drive properly? Also I hear a whining sound...
Started today. Car has been running great. Dim lights. Does nothing when key turned.
Tried disconnecting battery & it still wouldn't shut off
The sensor is severly rusted in and refuses to come out.
Car has not been driven five minutes or more. Need to constantly place water in radiator. Check oil no oil needed. Notice some type of oil leak after car has been parked in a particular spot for over 10 mins.
they leak right off the gas pump on the gas tank evrey time the engen runs
I had the car in park and idling and suddenly it roared up like a plane coming over and warning lights came on then it stalled I gave it a minute or two and then it started ok. So what's wrong I'm in Canada so used a ...
I've lost my owners manual and could not find the information in my haynes manual. I had trouble getting the spark plug out because none of the sockets I had would grip the spark plug. I used a 5/8 first then 13/16.
It just started a few weeks ago. You can smell gas and it is sucking the gas badly!
My car shut off today..I started it back up then I put the car in drive!It felt like someone hit me from the back...Then it started to grind very loud when ever I put it in drive.The car starts but will not move forwa...