Question about 2002 GMC Sierra 1500

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I have a 2002gmc sierra 2 wheel drive 5.3lit 8 cylinder

I am losin power.. the service engine soon light started blinking and I started losing the power. I put octane booster in, heet, because it started after I filled up with gas, I can only go about 50-60 mph. I changed fuel filter and it ran a little better but it is still not having the power it had before and it gets worse going up hill. I changed fuel pump about a month ago. sometimes it runs ok but sometimes light blinks again and I start losing power. I changed spark plugs too. I can 't figure it out. can you please help me?

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I have a 2002 gmc sierra 4wd, and having the same problem. In autos we changed plugs didnt work. Scanned it and it needed a computer reset :). and boom i was flying again

Posted on Mar 19, 2010

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You need to have the computer scanned for trouble codes before you waste any more money.Good Luck.

Posted on Dec 25, 2008

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