Hello
I've own an evo 7 , stock ecu and engine, an inline fuel pump and bigger intercooler.
rom id is 98640014.
the engine revs and boosts fine.
At idle the needle of the vacuum gauge is oscillating very fast and idle rpm is changing from 700 to 900,1000 rpm. The AFR gauge also oscillating between 13 to 16 . When turning on A/C there is no change.
It happens on a cold and warm engine, but it doesn't getting too low to turn off.
idle TPS value is 0.6v, no CEL .
I didn't find any vacuum leaks , but maybe some air solenoid?
Any ideas?

Thanks

 

Hey
Is this log file can tell something? http://www.filefactory.com/file/cd42...7_20.24.17.csv

This is the vacuum gauge video : http://www.youtube.com/watch?v=Y4Ye0KlAUPA
Its on about 50Kpa

Afr video : http://www.youtube.com/watch?v=qW2Uj0miAYc

Thanks