i used to own a 1995 chevy truck with tbi and what you need to do is buy 2 new injectors they sit right above the throttle body and they are easy to switch out they have 2 problems either get gummed up and you run lean or fall apart and you run rich this usually happens between 100,000 to 200,000 miles. i would recommend getting a new throttle body from jegs or summit they get better gas milage and are way better than stock but if you get after the throttle a lot it will get worse milage hope this helps you.