Go to Google and type in GM code reader 1.6 - All the answers you require are in the file that will appear - You don't need a code reader just a jumper wire
You should have the codes read to see whats wrong.
Depends on the engine the Park Avenue had in it.
show a diagram of a buick park avenue crankshaft sensor
If the check engine light is on then have it scanned for codes. I could guess you into bankruptsy. It is cheaper to have it scanned and repaired.
carburetor
The size of the engine in a Buick Park Avenue from the year 2000 is a 3.8 litre V6 engine. It is the same in both the "base" model and the "ultra" Model.
engine cover
If they are the exact same engine (3800 tuned port injection) then yes.
On the back side of the engine
3.8 liter
3.8 litre
Between your feet and the engine compartment.