I have a 97 Grand Cherokee with the 318, auto, and 4x4 and 160,000 miles. It's the Orvis package so it is quite loaded. Recently the zj has started to sputter and act like it wants to stall out (like it is out of gas). It will do this when cold or hot, starting up from a stop or just cruising along (any speed). It is kind of like the fuel filter is plugged. Is the fuel filter in the tank or on the outside. I've looked and cannot see a filter outside of the tank. No codes are showing even with my handheld scanner hooked up. If the filter is in the tank is it a separate item from the pump or integral with the pump. How hard is it to do this myself. Or should I get a shop to take care of it. I am quite handy at most repairs but have never dropped a tank for this. Is it real hard or not so hard. Any info would sure help Thanks in advance