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Rough Idle, Stumble When Ac Is On

6126 Views 13 Replies 8 Participants Last post by  saltlakedave
1997 GL - I'm experiencing a significant stumble every 10-40 seconds when the AC is turned on. There's no odd noise coming from the engine compartment. It is not the compressor starting up. It's happening when the compressor is running. This 'stumble' can be felt as a 'shudder', and the tach moves a bit.

Air is blowing as cold as ever. I bought a can of AC "tune-up" at Advance Auto Parts, but haven't added it yet.

Has anybody had this? Also - Where would I inject this can of snake oil? Is the port to recharge the system the one that's near the firewall on the passengers side?

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I'm putting my brain to this one.

My wife's Saturn does the same thing.
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