YES to the bolt question! Get a new washer, too. One whole lot easier to deal with at this point than waiting for it to possibly-eventually break.

You can try cleaning the MAF, but if you're getting anything close to 15 MPG, you're as good as you're going to get, in all likelihood.

Welcome to the Wire.

John B.

'87 Raider 2.6 Turbo Auto, Under Construction
'95 Montero SR, 35x12.5/15 BFG M/T KM-2's, Rock sliders, Qtr panel chop, gas tank lift, 2" BL, Aisins, 5.29s
'95 Pajero Mini
'98 Montero Winter Ed.
'04 Cadillac XLR
'03 Kawasaki ZRX1200R
'60 Ford Falcon 4Dr