Ok well some of you might know I just swaped a K24a1 into my 03 Civic Si. Well today I was just driving, minding my own business when my CEL comes on. And to my surprise, my car starts to run like pure crap. Well I stop by the closest auto parts store and had these codes pulled. 7 in total.

P0500
P1298
P1166
P0340
P0141
P0171

Sympthons im having are:
Crappy low speed acceleration, Rough running feel, Speed odometer is not working at all, Check battery light is on and stays on, EPS light goes on and off, car is sorta back firing. This is just to name a few things I noticed. Could this be a ECU problem?