I have a 2005 Buick LaSabre with 65,000 miles on it. It has the V6 engine, and an automatic transmission. It has been mostly garage kept since it was new. When I accelerate it sounds like water is sloshing around in the dashboard. Any idea what this might be? Asked the service manager at the local GM Dealer and he of course was clueless. Said to make an appointment and a mechanic could diagnose the issue. Hate to spend extra cash during these difficult times, so if anyone has an idea what this might be, please let me know. I thought about clogged drains, but don't know how to access them to unclog them.