Or call them and see if they have any, maybe not updated. I know you probably pay $75-$90 for 02 sensor at store.

Just don't drive it anymore. All joking aside maybe try changing your filters ie. fuel filter with a high quality one not the white box junk, (trust me on this one).

Quick question.

Does the '97 have Throttle body or Port Injection?

Throttle body, it's the part after your air intake and before your intake manifold.

Gotcha, Thanks.

I'm not sure what they call it. But it's not throttle body injection. TBI is simialar to a carberator where the injector is in the throttle body and the fuel is dispersed via the intake manifold. Our throttle body only handles air.

Its called sequential multiport fuel injection. So, a variant on port injection.

I wonder what they call the goofy set up on the Vortec motors? The injector is centered inside the intake manifold with 8 legs and a poppit valve for each cylinder.

Thanks guy

*Runs off to count his change*

I noticed a drop in fuel mileage when my cat got plugged...went from 28 down to 24 and also no power. I know it's not legal everywhere but I hollowed out my cat and got an O2 simulator so my engine light would be happy. Result was 29 MPG and the power was back. Maybe the U-bend delete would help too. I also noticed a small difference when I changed plugs, wires and put in a fresh air filter, I also use strictly synthetic oil in the engine and transmission. As others have said, it's important to keep up with the maintenance for maximum efficiency.