2003 trailblazer tries to die when I turn the A/C on. water was in gas cleaned on 2003 Chevrolet Trailblazer

Need help my 2003 trailblazer tries to die when I turn the A/C on anybody have a clue what could be wrong. My husband and Charlie are stumped they replaced plugs and drained gas tank found water in my gas in a quart jar 1 inch on top was gas the rest water I am goin to contact Shell station on that I am mad I paid 3.75 a gallon for water. Plus Bobby replaced a cylinder. 70 dollars later and it still not running right. Any help welcome.

by in Corbin, KY on March 16, 2013
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1 answer
ANSWER by , March 18, 2013
this could be an alternator issue. is the battery charging properly? check tensioner arm and belt for wear. test alternator by starting vehicle and disconnecting the battery. if she keeps running alternator fine. if not, alternator bad.