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Q: why does car idle get worse when we replace MAS? on 1998 Chevrolet Lumina

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Code showed MAS was bad, replaced with used part. Light went out, but car would barely run - it would rev high upon startup, then rev dropped and it would sputter and die/almost die. It just kept doing that in a cycle. When we unplugged sensor, the car runs much better, however check engine light is then on.
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Check the big rubber intake tube to be sure it is not damaged and installed/tightened correctly. - Try a new MAF sensor!