for about a month now i have had sputtering when i dont let my truck warm up. or if i hit the gas hard, since this started i have replaced the fuel sending unit, the fuel pump, gas tank, and fuel filter, also a new KandN filter that seems like a waist of money. any ideas? it bogs down and wont go. also gas millage is real bad (worse then before)

 

have you checked the fuel injector assy. under the plenum for leaks or done a pressure test?

 

no how would i go about doing that?

 

you need to do a fuel pressure test heres the link on test procedures...https://blazerforum.com/forum/showth...ht=fuel+system