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Discussion Starter · #1 ·
I have been having a rough idle and car bogs down when rolling widows up at idle. Looked at live data and saw my long term fuel trim was at 12 and when I tried to reset it said no communication. After I replaced my factory battery to body ground that had broke it let me reset the values but the long term values haven’t changed from 0 in almost a week and now live data loses communication I’m at a loss for what could cause these issues as I’m not great with electrical systems. Also drove 4K miles without throwing a code for misfire even though it apparently had an ignition coil that wasn’t even bolted in and that seems strange
 

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Discussion Starter · #3 ·
Chase your grounding and power feed connection issues.

Inadequate grounding is a likely cause of all of that.

It has to be grounded engine to chassis, and chassis to battery. Your fix may have been too small a wire as well
I fixed it with a 4 gauge wire and sanded down the paint at the body but I’m not sure where my other grounds are
 
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