well i got told the other day that a spider injector might be the problem with my blazer. is the guy b.s'in me or is it real?

 

that's a tough one. Telling us what's wrong may help.

 

Not to mention what year/engine your Blazer is.

 

its a 97 4.3 vortex

i got a diangoist test run on it and it said that my num.3 is miss firing and my O2 sensor(bank 2) is misfunctional.

about a year ago it blew a intake gasket and slung oil all over the place and we let it set about 6months before we got it fixed.