Why does the alternator stall my engine when I plug it in.

ECM has to relearn idle strategy any time battery is disconnected or engine will stall at idle... Start engine and keep it running by using throttle until it will idle again!

Thanks, I try that when I get off work.

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Still fighting this. Had the Alternator checked and it checked fine but the still the same thing. Did the relearn and pass code steps; same thing. To make double sure on the alternator I swapped the alternator with one from another car; same thing. I then started opening the harness to see how the wires looked inside. After about a foot (from alternator) I stopped because they still looked new. I then became suspicious of the computer. I ordered one programed to my VIN number; installed it; same thing @ran fine without the alternator plugged in, killed the engine when plugged in. Though the wires I looked at looked good, only thing I know to do now is to figure out were the wire from the alternator goes, cut it there and at the alternator and run a new one. Any ideas????????????