Originally Posted by SafeChav
I would strongly recommend anyone that runs an MFI car to disconnect the engines breather system from venting into the airbox, by blocking the pipe on the air box
Currently any air leaks the engine itself develops from things as silly as a leaky sump/rocker gasket will cause running issues

done it to mine and im now venting to atmosphere
positives are the car now idles and cruises better,this accompanied by removing dump valve was like driving a completely different car
negatives are the car now smells like exahust fumes with a slight optimax tinge,need to get a catch tank pronto me thinks