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The car is 98 deville 130k, It is throwing up the service idle control warning, but it does not throw a code. I have notice a drop in my mpg since it started. I have cleaned the throttle body, idle air sensor , and the egr valve with no help. Please someone point me in the right direction, I am clueless at this point

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Faulty MAF sensor or faulty TPS bad/misadjusted. Vacuum leak. Codes should be present, but I have heard of codes not displaying with the cars system but do display on a scanner.....

GM Reman 4.1 engine Dec '08

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