car idles fine until i turn heater on, then it cuts out on 2004 Buick Rainier

When heater is on rpms go from 800 to bellow 500 then jumps back again

by in Cambridge, WI on April 12, 2013
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1 answer 2 comments
ANSWER by , April 12, 2013
ck battery and charging system
COMMENT by , April 12, 2013
Brand new battery. Could it be the alt?
COMMENT by , April 12, 2013
yes very possible