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
speedometer still does not work, do you have a idea what may be the problem.
the air suspension warning light
I changed the sway bar, ball joints what am I missing
While driving down the interstate, the dashboard light went dim, the AC motor stopped working, and the car shut off and would not restart. Had the car towed to a dealer and was told the computer said it was EPR Valve? what would that have to do with a car losing electrical power. I would think alternator.
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 every once in a while. It also drives in reverse with no hesitation.
The car has a vinyl top that is cracking and pealing. has been setting out in the sun.
The check engine light has also came on. There is an OFF button also that comes on when the car is placed in drive.
The light only came on infrequently at first, but is on more often as time progresses - during the midle of the night with the door shut. I suspect that the pin switch has worn out. Is that likely? Is it something a person can purchase and repair, or is this a job for an electical shop? Thanks
It's out and I tried disconnecting the battery but it doesn't help!
my headlights and low light tail lights will only come on when the car is off and the headlight switch is turned on. dash lights and the interior clock light wont turn on at all. I just bought an LCM so i know it is not that... have no idea where to go from here...
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