When driving in heavy rain (10 to 15 mph), through water pooled ( 2 to 3 inches) on the roadway, the engine will die and the speedometer will give erradic (high & low) displays; even though I'm coasting to a stop. After stopping and sitting for a few minutes I can restart the engine and resume travel with no problems unless I encounter more water. Dealer has replaced the "crank positioner" sensors but the problem still persists. The Service Manager says it may be something I have to live with because they can't find the cause. He did suggest that I take it to a larger dealership with more "seasoned" technitions. I feel that this is a safety issue, especially if I'm in heavy traffic (as it did on 08-30-03 in San Antonio, Tx.) when this happened the last time. Is my 2000 Deville the only one that can't drive through a little bit of water???? Any suggestions and/or information will be greatly appreciated. Thanks.