I finally got my gsr swap done in my DA9. I ran into a problem. When I start up my car it runs great. But once I put my foot on the throttle the idle gets REALLY irratic. and it threw a po20 code. The idle goes from 2 to 3 and it drops and increasaes rapidly. Anyone have an answer to the po20 code? or my idle problem

 

check all your grounds

 

also check to make sure there is no air in your coolant system, check for any vacuum leaks, check the FITV (search for FITV)

 

what is the FITV? I think I know what it is but not sure