I need /o/'s opinion on this: >have 1997 Toyota Celica

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I need /o/'s opinion on this:

>have 1997 Toyota Celica ST with a 1.8l 7A-FE motor with 260,000 miles on the odometer
>car was left out overnight with hood open in the rain
>car now has misfire on cylinder 3 but seems to come and go
>spark plugs, spark plug wires, and ignition coil all check out ok
>distributor rotor and distributor rotor cap were old stock parts, rusted out and rotor was missing chunks
>replace distributor rotor and distributor rotor cap
>car only runs slightly better, but still sputters occasionally

>If the car is idling, it will go from 900 and drop to 500 occasionally then back to 900
>while car is idling, and you slowly and gradually push gas pedal, the engine will rev smooth all the way to red line
>if car is idling and gas pedal is suddenly pushed all the way to the floor, it sputters and takes longer to reach redline while vibrating the whole car
>if driving around and RPM is at say, 2,000-2,500 and you punch the gas pedal, it accelerates smoothly with no sputters
>if stopped and idling, and suddenly punch gas, car struggles to build speed and feels like it's going to stall
>if cruising around at constant speed, car occasionally sputters and looses power, but stops after 2-3 seconds

My only other thoughts are the fuel injectors, the throttle position sensor, and/or the MAP sensor need cleaned/replaced but I fail to see how a little rain can suddenly make them dirty or non functional.

What does /o/ think the problem is?