I HAVE A GMC 1500 4.8L AND IT DOES NOT START. I ran the codes and they are P1637 and P1638. Can you help me figure out what is wrong?
Dec 28, 2009 at 4:45 PM
2001 GMC C1500 TROUBLE SHOOT
2001 GMC C1500
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Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
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