I found a greddy piggy back yesterday wired in my car while i was testing a new ecu i bought, i unplugged it and test drove the car and it idles funny and is giving me code 3 and 13 map sensor and iacv, why is this?? while the car is plugged with the piggy back it runs fine but once i unplug it i get cel and idle won't go down 1100 rpm even with throttle screw closed all the way.

what do you guys think?? my car feels like is loosing some power at 3rd gear is a d16z6 with intake and exhaust but do you think the piggy back has anything to do with it?? should i leave it there or take it out and try to fix the map and iacv, the weird part is that i don't get no cel or funny idle when piggy back is plugged.

i just wanna hear opinions is not really a problem what should i do??