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Rough Idle, Stumble When Ac Is On

6125 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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should be on the firewall on the A/C lines you just follow them around youll end up finding it sooner or later it has a 2 pins plug on it. WHen was the last ime you cleaned the IAC and gave it a tune up?
Whats the motor out of? Did you replace the upper intake manifold? Should check too see if there is any codes in the Computer
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