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Old 07-23-2009, 11:02 PM   #15
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: 1990 Chevy 4x4 low speed miss

If it won’t flash out a code the ECM could be bad and running in a backup (limp home) mode. That would explain it running poorly.
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