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I see.I'll pick up a can and give it a shot this weekend.thanks for the advice

Thanks for the great response.I thought about seafoam but am scared it flushes something loose and makes it worse or damages something.have you had good results using it?

Thanks a lot man.that gives me a good head start on things to try.I'll try your suggestions and see what happens.thank you

Thanks for the reply.I have been googling it and was wondering what anybody ran across to fix the codes from their experience. I'll start with the gas cap and see what happens.thank you again

I have a 98 Tahoe with 5.7 and has had check engine light since I got it a few months ago.Fuel pump went out on me and had it and fuel filter replaced. I get po171 and po440 every couple of days.it runs fine and I'd like to fix this.the Tahoe is my long term project so any help I can get to...