i had a similuar issue when i was running my 3400, i belive it was a stickey idle control valve, i just did a seafoam treatment to it and the engine ran like it was new, then a few months later i bent a valve trying to to a valve stem seal job and just tossed a 3500 in it instead
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2001 ALERO GL SED 4 DR--Build Date: 08-16-2000. There are 17 2001 ALERO GL 4 DR vehicles (0.019%) matching my exact options list.
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