How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Daryl Your Own Question
Daryl, Shop Owner, Master Mechanic
Category: GM
Satisfied Customers: 12547
Experience:  28 years experience, Master Mechanic
Type Your GM Question Here...
Daryl is online now
A new question is answered every 9 seconds

2004 GMC Sierra 1500: maf Sensor, checked fuel pressure 60 psi..hills

Resolved Question:

2004 GMC Sierra 1500 4.8L
got P0171 and P0174 codes, Changed MAF Sensor, checked fuel pressure 60 psi. I still get P0171 and P0174 codes, and lack of power up hills
Submitted: 6 years ago.
Category: GM
Expert:  Daryl replied 6 years ago.
These have a big problem with the intake gaskets leaking and causing the codes and symptoms you are describing. This is a very common problem and replacing the gaskets is the fix for this problem.

Edited by zzdaryl on 1/23/2010 at 8:26 PM EST
Daryl and other GM Specialists are ready to help you

Related GM Questions