Can't get rid of service engine light!

[aditulli]

I have a 96 Tahoe, and I cannot get the service engine light to go away. when I run the codes, I get p0102, p0171, and p0174. The codes refer to a bad MAF, and both exhaust banks running lean by readings from the o2 sensors, respectively. I have cleared the codes but they come right back. the vehicle has a brand new MAF, and a new ignition switch. I have had all of the parts tested by a dealership and they seem to be functioning properly. the vehicle seems to be running just fine. does anybody have any suggestions?

 

[Tbruz]

If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate.

Read more: http://engine-codes.com/p0171_chevrolet.html#ixzz3XWIeuqVp

 

[aditulli]

Thank you for the input,

 

[Bowtiebug]

I would also lean towards a intake / vacuum leak

 

[aditulli]

That's what I was thinking as well, when I purchased the vehicle I had a Chevy mechanic rerout many of the vacuum lines because they were missing, but that was 2 years ago and this just started recently