Just curious, what is the battery voltage with the engine running? I'm assuming you have a multimeter here... I have seen some idle issues related to a dying battery that was only holding about 12.9 volts with the engine running. Should be 13.4-14.4 volts at idle.
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91 GT Convertible
2006 Nissan Titan LE Crew Cab
2014 Peterbilt 337/Marion 22' box
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