When a MAF sensor malfunctions, it can do so in a very subtle way. It can create an erratic or incorrect signal on initial take-off, which can cause an elongated shift. It can deliver an incorrect signal at higher engine speed, which can create shudder that could be mistaken for torque-converter-clutch (TCC) problems. It can cause coast-downshift clunks, especially as the vehicle is coming to a stop. It can even cause a slide-bump shift. It is a major input for electronic pressure control that will result in elevated line pressure.