Pete do you recall your engine ticking when this problem occurred with the plenum gaskets? My 99 LTZ has a 3.8 and blew the number 6 misfire. Coolant is leaking but the electrode on the spark plug was also bent. I can pull the heads since I have the intake off now but I hate to pull the head just so. I cant remember if I may have dropped that plug. I did replace it and spun the engine over and it didn't bend.
Anyway, I know its been a while since you posted this problem
