i have a 2001 wrx remapped to about 250-270bhp so iwas told when i got it and do believe its not standerd because of the boost it kicks in most the time! but its had all its belts done which i have prof of but as its my 1st impreza ihave no idea about them and could do with some of yous commenting it drives fine most the time but doesnt allways boost and kind of judders before boost and when you park up not in gear no were near any pedals it idles at 1.000rpm then slowly drops back to just above 0.500 were it should be but only does it half the time :-/ any advice would be very helpfull

 

dump valve?

 

yes it does have adumpvalve and a induction kit

 

i'd remove the valve or put the standard recirc back on and see how it is then

 

Iv had this with my classic put a recirc bov back on, tried another boost solenoid and maf still the same..
Also no codes

 

so did you ever solve the problem and if i take a pic of my engine/dumpvalve and put the link on could you then say what you think because im not 100% what it is it just sounds like a dumpvalve to me could be a blow off valve thow :-/