Ive had my car for about 5 months now. I have a wrx into a 2.5rws swap done. When my car is cold and is trying to warm up the rpms bounce from 1500 to 750. Just revving up and down up and down etc. Also when i step on the gas, the motor bogs then revs. After the car is warm all the problems go away, but until the motor is warm the car runs ****ty. Does anyone know what this could be? I thought it might be the idle control valve, but if this was the case wouldnt the car idle funny all the time? Also i changed it out wiht an ICV that works so unless that one is bad too i dont think it is that. Any help is welcome.

kevin

 

bump

 

is the cold start richness way off??

 

i have no idea. My friend told me that the bog is because my car is running rich, but isnt it supposed to run rich at cold start? my main consern is that idling