95 FZJ80- Rough idle only when the AC is on. Otherwise, low idle at 600 rpm. Where should I begin? (1 Viewer)

rdcnj

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Based on the fact that your RPM's drop like the truck is going to stall, I think there is a fair amount more at play here.

It's possible that the AC compressor is starting to go bad and it's causing a massive load on the engine.

I would suggest two things:
  • Check the amperage being pulled when the AC is turned on - High amps = high load - Could mean compressor is going bad and it's physically slowing the engine down when it engages.
  • Check for air leaks with smoke - Air leaks will cause a serious amount of weird issues, but I would think you might notice some other drive-ability issues is it were that serious.
From the chair, my money's on the compressor. But there's plenty of testing and checking to do here.
 

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