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'90 DeVille '97 DeVille
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Does the 1990 4.5L have the EGR tubes referred to in previous post? If not, what is the procedure for cleaning it?
 

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Yes. Remove aircleaner. Hold throttle blades wide open and look down the throttle bores with a strong light. The tubes sticking up at you (below the throttle plates) from the floor of the intake manifold are the EGR tubes. Use a piece of stiff wire to rod the deposits out of them all the way thru down to the passage below. Simple and easy.
 
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