No offense buddy, but you complain about your Mercury Marquis too much. The car is almost 16 years old, you probably bought it cheap, and I bet it has high mileage too. If the transmission bucks a little, its because the overdrive sticks a little bit. Have someone put in a shift kit and it will fix it not to mention make that car fly down the road. The other things you mentioned are normal for the age/mileage of the car, and you can fix most things on that car yourself with the simplest set of tools.
I have a 1987 Mercury Grand Marquis 2 door that I bought from the original owner with 120k on the clock. It runs smooth, drives fast, and is comfortable as hell. I haven't had problems with mine and been driving it for 7 months now and I love it.
If you complain about spending a grand in a year, try spending 3500 in 5 months. I did that on a 95 eagle talon, which is now sitting in my driveway with a blown engine after I just put 700 bucks into it. I also spent most of the time doing the work myself on that car, since parts and labor for newer cars are astronomical.
Maybe I'm wrong and yours is a lemon, because mine has treated me well and its had a good life. However, the majority of mercury grand marquis are reliable, safe, and very cheap to keep. Not to mention Ford does not build cars as good as did when yours or mine rolled off the assembly line nearly 20 years ago.
I bought my 89 Marquis LS for 500 Dollars last October. I am afraid I must disagree with you. The vehicle is quick, reliable, and extremely comfortable. I recommend this car to anyone and everyone. Keep in mind, this vehicle is 16 years old so of course there are going to be problems. If you don't like yours, sell it. I am sure it will be picked up immediately!!
If your transmission keeps bucking, try adding some Lucas transmission oil to the tranny fluid. I've got an 89 GS that was bucking for a while until it got out of control, that Lucas oil cleared it right up and she drives smooth again, not bad for under $20 a bottle.