hardbodyfixer

1995 nissan hardbody xe reg cab,2.4l,automatic,175,000

i did what you said as far as reseting the tps sensor and replacing the iac vavle and gasket.things are back to normal,althought i have not professionally had the fuel system cleaned i have changed the fuel filter and run a couple of cans of sea foam (one per tank) and last time i check one tank of gas i got 291miles and it took 13.6 gallons to fill it back up for a total of 22 miles per gallon out of my automatic .since cleaning fuel system and replacing fuel filter it seems to be getting 2 miles less per gallon less than it did before i changed anything or added the fuel treatments.it was a about 24 per gallon.filled up this time with no treatment ,will see what happens.any tips on what is going on or does this sound normal or what other things can i do to improve the mileage? idle seems a little better but still not up enough to me when in gear and stopped it is at about 600 rpm (dash trembles a little).and about 900 rpm in park.again thanks for your help!!maybe with your help i can get close to where i need to be?? i guess it's back to the drawing board for now?