Mass air-flow sensor.
Air leveling shocks have gone out.
Transmission kicks hard after an hour of driving, and will not shift correctly afterwards. Apparently a common problem, google buick transmission shifts hard.
Windshield wipers stop in the up position.
Fuel gauge goes crazy when below 1/2 tank. Another common problem.
Supercharged, has lots of power.
The traction control is slow to respond.
Rides very nicely until you hit a bump.
Sound system is nice.
Looks very nice on the inside.
Seats are comfortable.
HUD (head up display) is a very nice option.
What do you expect from an 11 year old car with over 200,000 miles? None of the problems you mentioned are very serious and even the transmission is a fairly easy fix if you have a good mechanic which can properly diagnose it. Don't let them fool you into getting a new transmission. I have owned two Park Avenues a '99 and currently an '05 and really wish they still made this model. I will probably try an Enclave next.
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