After unusual below freezing weather here in california my 94 prizm is idling really rough and sputters in gear what might be the problem

new spark wires. old wires hate, cold damp weather.
spark plugs, cap,rotor wires, try the 60k mile tuneup. per the opr.guide.
magic happens....
the map is ok.
and to test a map you need the graph and you need to compensate for altitude and local weather (barometer readings) to correct what you see.
is the check engine light glowing running?
most maps read like this, 1bar maps.
http://www.fixkick.com/sensors/my-map.html#Jeep

i bet your's is ok. the map.
your car is a toyota corolla in snake clothing.
the toy FSM covers this is find details.

It wouldn't hurt to change the plugs. I never run plugs over 20k in my cars. Also, I've said this a lot in answering similar questions here, but check the O2 sensor, if it's clogged the vehicle can run rough especially when its idling and can go away when the RPM's climb

Vacuum leak, cracked hoses or gummy vacuum hoses.

Check your fuel pump which is located at the top of the fuel tank. Dismantle and check the "o" ring which may have disintigrated if you are using Gasahol

sounds as though the fuel system is set for a differant climate then your living in take it to the shop and get it set for your area

i have had 2 Dakota's a 4 cyl "LACK OF POWER" but never had a problem.
the other A 318 V8 14mpg but was a beast 4wheel drive the only problem I had with the v8 was when it rained water got on the dash bord,,,never figured out where it came from,
BUT I'd buy a 98 or newer one...
PROBLEMS LISTED BELOW!!

Air conditioner: If the air conditioner gradually stops cooling and/or the airflow from the vents decreases, the computer (PCM) may not be sending a signal to the compressor clutch relay to cycle off, which causes the AC evaporator to freeze up. (1991-95)

Automatic transmission: If the transmission will not engage when first started, chances are the torque converter is draining down. Chrysler will correct the problem by installing a check valve. (1993)

Automatic transmission: If the transmission won't upshift in cool weather, it is probably due to defective cast iron seal rings in the governor drive. (1992-94)

Engine fan noise: In warm weather, the fan makes a roaring sound. Dodge will replace the fan, the fan clutch, and, on max cooling systems, the radiator cap. (All)

Exhaust backfire: Exhaust backfire and/or a popping noise in the exhaust may be caused by a defective Powertrain Control Module. (1994-95)

Oil leak: Rear main seals on 2.5- and 4.0-liter engines are prone to leakage. To prevent future failures, Chrysler has a rubber plug available that goes in a hole above the starter that protects the rear main seal. (1996)

Oil leak: Oil leak at the filter on 3.9-, 5.2-, and 5.9-liter engines is likely due to a warped adapter plate. (1995)

Oil pump: Oil pump gear wear results in bucking and surging when the engine is warm and lack of lubrication when the engine is cold. (1992-93)

Rough idle: Because of a problem with the idle air control motor, the engine idles rough, stalls at low speeds or when decelerating, especially in warm weather. (1992-94)

Suspension noise: Front ball joints wear prematurely forcing relacement of lower control arm as well. Replacement joint with grease fitting is now available. (1990-96)

Transaxle leak: Automatic transmission fluid leaks from the speed sensor in the transmission. (1994)

Water leak: The roof seams leak water that seeps down behind the dashboard onto the floor. (1993-95)

There is no TSBs for rough idle and the term rough idle can be taken two ways one is like a vibrating idle which is motor mounts wore out. The other is a slight miss in engine and there are are quit a few reasons fot that but the most comon reason is a vacuum leak. But the way you described you problem park and reverse I leaning more torwards a bad motor mount due to a vaccum leak would also do it in drive.

Could be a vacuum leak as it falls off under acceleration and does not play a part then. Check for broken or cracked hoses.....

Cold start injector could be bad, or you could have a small vacuum leak, like a cracked hose. A vacuum leak is most noticeable at idle, when engine cold.

There are 2 common problems on this concern. 1st maybe a dirty MAF sensor. Remove the MAF sensor and clean it with a good electrical cleaner and air dry or light shop air,then reinstall and do a couple of wide open throttle burst to reset it.
2nd problem and we see alot of this is the orings between the upper and lower intake manifold leaks.You would have to remove the upper intake manifold and replace them.