Quote Originally Posted by tjvdubsport View Post
mines getting 14.7 mpg and no check engine lights . put a fwi, and some 605 autolite plugs this was after i was getting that awefull mileage ...i already cleaned the MAF sensor and the TB ..
what could be wrong ? havent changed the fuel filter nor pcv valve .. i think im gonna return to the 606 oem plugs ..

All I can say say is start with a basic tune up and go from there (cheapest first).