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Thanks rockenthebowtie and samotahoe I replaced the solenoid on the manifold 2 weeks ago and so far no more CEL thanks guys for your help it's much appreciated hope you guys had good holidays and a happy new year ..... Once again thanks for the help and advice guys.

i will check that tomorrow, i do have the code scanner and this is the only code i get, another thing that also happens once in a while is that my abs/brake light some on while im driving .... thanks for the help i will post and keep updated what i did and if it helped.

I have the P0440 code on my 2002 Tahoe LT model, i already changed the gas cap with a brand new one from the dealer and code still comes up, what other things can i or should i check and replace? thanks