02 sierra

[andrechan]

hello, i have a 2002 gmc sierra 5.3l my truck has not start like it should a couple time and sometimes seem to happend during accelaration of highway speed my truck has stalled what should i be looking toward i changed fuel filter checked fuel pump and its good when the truck stalls the engined light doesnt come on or throw any codes the truck has 250.000 km all opinion needed i need my truck running tip top right away spark plugs were changed at around 170.000km and wires also

[00Silverado4x4]

If you haven't changed the fuel filter I would say that would be a worth while expense. Once done see how it does and go from there. That's my thoughts.

[andrechan]

 

1. yea fuel filter was changed still does it
   

 

[00Silverado4x4]

Try cleaning the MAF? Air Filter? Double check plugs?

Maybe even a possibly bad fuel pressure regulator? (Not sure how you would test for that though)

[andrechan]

i have an aftermarket k&n air intake system filter brand new i could check the maf sensor someone had mentioned plugged cats or bad 02 sensor that possible????

[00Silverado4x4]

Yup, they certainly aren't going to help if plugged up or if they are shot. With as many miles as you have I'd be looking at everything from intake to exhaust just for routine maintenance. Hopefully along the way you'll find the problem.

[andrechan]

what would happend if i took the cats out would the truck run like crap cause when the truck running its a hundsred percent and sometimes stalls piking up speed

[00Silverado4x4]

Possibly, I'm not a certified GM mechanic, equipment I work on doesn't have emissions. Everything I've learned about these trucks has been from this forum. Take a look in the Engine & Powertrain section for some ideas on what may or may not work.

Sorry I couldn't be more help.

[txab]

Have you checked the fuel pressure regulator? Have you checked actual fuel pressure reading?