Originally Posted by raviaan

have the same problem with a 98 bonneville.... I punched the gas on the freeway to pass someone, all of a sudden my check engine light was flashing, and I had a little rough running. I got the car home and shut it off, and it would not start after that. I pulled the plugs and they had coolant on them. I pulled all the plugs, cranked it, and coolant came out. I removed the intakes, and the upper intake (top of lower) was an inch deep in coolant. The lower intake manifold gaskets were cracked up a little. I replaced all the gasked, replace plugs and wires, and reassembled. The car took a little to crank over, but ran for about 15 mins, and started displaying problems again, so I shut it off. The car would not start again. I pulled the upper intake again and there is coolant in there. I did not notice and cracks or anything, and was very throrough about checking everything... any ideas?

Thanks!