i have a 2000 chevy impala with a 3.4L engine. i bought it a year ago and i drove it for 6 months and i thought the thermostat went bad because that's where it appeared to be leaking from so i replaced it once and the seal 4 times then my uncle informed me that it was more than likely the intake gasket. so i eventually ordered it and before i took the intake apart i flushed the water system 3 times and i was still getting junk out of it. so i went ahead with replacing the intake and i put everything back to the torch specs. started the car up and i think i'm sucking water into the number 2 cylinder. it's the cylinder that keeps misfiring and i can tell its burning fluid by the exhaust smoke it's white smoke and feels moist when you put your hand in it. PLEASE TELL ME ITS JUST THE HEAD GASKET. but trust me i am prepared to hear that it is a cracked block