1994 Chrysler LHS Misfire Problem

[1994LHS]

Past week, I drove my car on sunday, It sat all day monday and when i went to leave tuesday(wet day) Car would not start. So Later in week, i changed the plugs, car started right up, but ran rough as hell when car warmed up and i was driving around 40-55mph. So then I went and changed the Wires as well. Once car warmed up same thing. My father checked it over and said it was my air filter. Took it out and it ran fine for him, and fine for me back to my house. So Today i put in new filter, and fuel injector cleaner. Warmed up car, drove it about 15 miles, and it started to do it again. Pulled over, took out the filter and began to drive again, Still doing it but its not as bad as before. My car gets 22.8mph. Driving yesterday from my dads thats what it got. And today its 18-20mpg now. Im stumped as to what it can be, I figured its a sensor that controls the air fuel mixture, and car is getting wrong info and it has misfires. My father says to go and change the Cold start temp sensor, which could be causing the fuel not to thin back out once warm and runs rich. If not mistaken this sensor is next to the thermostat housing held in place with a brass nut. Any Ideas on what i can do, as car fires right up and idles fine, when i take off its fine, but once i get to a cursing steady speed thats when it happens, which makes me believe the air fuel mixture is off.

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[1994LHS]

Im doing some reading and It might be the MAF but not 100% Sure

[1994LHS]

Ended up getting a code read out on the car by turnign on the key on off 3 times.

Flashed 12 51 55. Lookedu p codes and only one of concern in 51 which is O2 Lean.

Car has jerky acceleration and im burning though gas like nothing. Had half tank friday and its now monday and its on eighth tank after 50 miles driven. So im going to go ahead and have the 2 upstream o2 sensors changed