yeah get some one elses maf on yours and see if it cures it?? tbh if it is air leak it will suck the bubbles in unless of course its blowing em out??!!!! could well possibly be maf i have had 3 scoobys now and they are always mafs on them. not 100% sure on vr6 but wouldnt put it past it!!! its gotta be air i reckon just for the simple fact its over fueling ecu is trring to compensate for mixture??