Can be a fee things, but based on the fact that this vehicle is 17 years old, and it is only missing at idle, I would suspect you have a vacuum leak. Replace all the vacuum hoses under the hood. Replace one at a time as to not get confused. A very cheap repair that will do wonders for a miss at idle.
miss alignment of tires
Becaue if it didn't idle, then it would not be running.
Unlikely. A faulty IAC will give you poor, erratic idle speed.
no
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back of engine below throttle cable hard to change, i paid a mechanic to change.part cost about 40.00.
its on the trottle body
Might be a valve hanging up
Engine miss or rough idle, or broken motor mount
According to my Chilton's Auto Repair Manual : A 1991 Lincoln Town Car holds ( 18.0 U.S. gallons )
For a 1991 Lincoln Town Car : " regular " unleaded gasoline , 87 octane
A faulty camshaft can cause your 1991 Nissan Maxima to idle erratically. A diagnostic test could verify the cause of the improper idling speed.