this is more like my symptoms without the MAF I might as well pedal it, usually it pulls reasonably well in low gears/low speed, seems to go flat at about 40-50mph up a hill, struggles to maintain speed of 70+ up a slight incline I think its getting worse but the change is so gradual. Is the sensor a hot wire type, is it getting dirty/deposits over time which would mean that the wire doesn't cool down so fooling the ecu to add more air and making the mixture too lean in these circumstances?????