Change air filter, clean TB, Use a cleaner to clean the UIM. Didnt see if you cleaned the IAC, check the fuel lines, make sure there are no leaks, also check the fuel filter, its easy to get to and get off, simple look under back right passenger side, pull white plastic clips, and then disconnect.

My 95 got around 200 per tank, and my 99 gets about 250-260 per tank. (miles that is)

95 SES Sold 99 SE Sport Sold 99 SVT T-Red Tan Interior. K&N, Magnecors, 19' Theorys, And some audio stuff.