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Discussion Starter · #1 ·
About a month after i bought my trailblazer the battery went dead in it i replaced the battery now my headlights flicker every so often when i am driving at night and the interior lights seem dim and flicker as the headlight do also some times it develops a wild idle all these problem happend after i changed the battery can anyone help me :bonk:
 

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2003 gmc envoy_slt
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Sounds like a bad connection for the light problem. Go back, remove the battery cables and clean the connections. Or at least make sure all connections are tight. Have you cleaned the throttle body? Disconnecting the battery would have reset the PCM, which would account for the bad idle. And if a connection is loose could keep the PCM from relearning to compensate for the dirty tb.
 
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