I have a 2000 ford expedition 5.4 not running right. If you step on the gas quick at idle it will Give a slight hesitation and then rev up. While driving it sputters some but is really bad when it needs to down shift. I changed the fuel filter. Nothing. I cleaned the maf sensor. Nothing. I am not positive the maf sensor is good though. It had a lean code bank one and two which I cleared and they have not returned. Before I spend over 100 dollars for a maf sensor I thought I'd check here for ideas??? Thanks