The car wouldn't start…long story short, I changed the fuel filter. Lot of fuel on the inlet side of the filter, but NO fuel on the outlet. The car ran great. Five days later, the car won't start. Changed the fuel filter…the car ran great. Now the car is acting up, not responsive. 40K miles. I have a couple thoughts such as something in the gas tank or the fuel pump is going. I haven't checked for fuel pressure yet, but its on the to-do list. I haven't changed gas stations and can't think of any other recent changes. Any other suggestions?