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Engine trouble codes

Tiny
MITCHELLBURY
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 186,000 MILES
Hello, I have a 99 chevorlet silverado w/ 5.3L V8, extended cab, 4x4. I have been having issues with the engine surging. It acts almost as if the timing is off just a bit, which shouldnt be possible being its efi and the ecu should take care of any issues like that. It had been running like a dream in the summer. I live in MN and this has gotten worse as the cold sets in. I did get a new throttle position sensor, changed plugs, and other small misc parts(though I dont think that pertains to this). Is there any other areas that might be worth checking? I just had it in the shop and paid $1600 and got nowhere. Any help would surely be appreciated.
Thanks-

P0171 System Too Lean (Bank 1)

P0174 System Too Lean (Bank 2)

P0300
Random/Multiple Cylinder Misfire Detected

PO449 Evaporative Emission System Vent Valve/Solenoid Circuit

PO507 Idle Air Control (IAC) System RPM Higher Than Expected
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Thursday, January 20th, 2011 AT 2:45 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Based on the codes you have, it sounds like you have a vacuum leak. What did they do for 1600 dollars? Have you checked the intake for vacuum leaks. There were some problems with them from 96 to 99.
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Wednesday, February 23rd, 2011 AT 7:33 PM

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