Is it EGR valve? intermittent rough idle

[Fresco]

i think you should def get it scanned first even after you reset the ecu it will still store the code (ask me how i know lol) but it looks like the sensors are connected to 2 different solenoids on the mani, one i assume has a 1 way check valve) but imma take a guess and say maybe some dirt or even condensation has gotten into those sensors and has corroded them but only a sensor test/ecu scan can confirm my theory

 

[fkmp5]

thanks for the help everyone, I changed the coil packs and wires (spark plugs were already new) and the car ran smoother, but i still felt like it would intermittently misfire but really rare and really random. however, the scanner showed 0 Codes now (the P0303 went away). I wouldn't figure it out since it was so random and I drive the car so little. I got $4000 for the Protege5 at Carmax and bought an '08 WRX