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Discussion Starter · #1 ·
Headed up to NH this weekend in the '02 wagon (vulcan) and noticed the engine would stumble/misfire with the a/c on. Turn off the a/c and it seems to run fine. No CEL and no codes when checked with my scanner. Is the a/c that much of a load? Car now has 109k miles.
 

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Discussion Starter · #3 ·
It does. The a/c is working as it cools the car and I can see and hear the compressor kick in.

Now that I think of it, the idle gets rougher when the a/c kicks on.
 

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If it is missing when driving then I would ask when is the last time the engine was tuned up?

If it is just at idle then I would suspect a sticky IAC.
 
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