Yes.
It is screwed into the exhaust manifold on the rear of the engine.
below thermostat housing little to left
my sons 1995 new yorker with the same 'symptoms' was diagnosed with needing a crank sensor valve, parts charge $125 total with labour $300
In the gas tank
Yes, it is built on the starter.
remove glove box
5w30 or 10w30
10w3010w30
32 oz
Front of the engine, behind the engine mount.
No the engine will not interchange.
Unlock the doors with the key.