My s14a was spluttering and hesitating just before coming on boost but once on boost pulled through to redline with no problems, finally got round to it and took the maf (z32) off and cleaned it, it had a bit of oil in the bottom so cleaned it all throughly and put it back on, car ran great no spluttering or hesitating and boosted fine... that lasted about 2 days it's now developed a slightly different problem car runs fine and will boost to red line but after coming off boost revs just drop completely even if I put my foot back on the throttle there's no response for a couple of seconds then it will sort of hesitate and get going again anybody have any idea what my problem may be?