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where is the egr valve on a chevy 4.3 and how do i take it off on 1990 Chevrolet S10 Blazer

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where is the egr sensor on a 4.3 chevy and how do i take it off/?
(1) Answer
It's on the back of the intake on the passenger side. there is a bolt on the underside of the diapham. It might be cover with oil and dirt. I believe it is a 13mm.