Engine running rough at Idle : Going to Emission Test Station for $15 test HD
i got old 1989 Chevrolet Caprice, 5.0L TBI , running rough at idle only.( at cruise runs great) for $15 only, i can get HC , CO & O2 reading. to help me do diagnostic, which section to investigate further. test results indicates only high HC @ idle . so , later i have to check ignition & EGR system , before compression test.
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