Sounds more like an air / vacuum leak problem than a faulty MAF.
I would go over all the hoses & tubes again just to make sure that you have replaced all the lines & screwed them down tight. One could have pulled off during assembly and the initial drive.....
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
|