2003 Buick Rendezvous engine misses

>> just had the same problem on my 02. I had no compression on cylinders 1 and 4. The intake gasket on these are made of plastic and mounted in rubber. Over time the plastic cracks and the rubber can't stop the coolant from seeping into the block. If your look up at the back side of the motor from under the car you may see some of the coolant. It makes the black paint on the block bubbled. Good luck