Hi I have a 98 plymouth neon and the other day it's engine light came on and it started runnung rough slight loss of power, sputtering, checked the engine code and the came up as
12
43

We changed the plugs now it only reads code 12

However it still is runnung rough ,slight loss of power, sputtering, with great hesitation going up my hill, any help would be so awesome!

 

Did you reset the PCM? Inspect the coil pack and spark plug wires.