Ok, this is aboot my Grand Am.
The other day, I was driving home and it felt like I lost a cylinder. I mean, from a stop it was so slow, and sluggish, RedAss's Yugo could have beat me in a race! THAT BAD. I had a hunch what was wrong, so today I decided to replace the plugs. When I pulled the first one out, I saw it was a Bosch platinum. The head was replaced less than 20,000 miles ago and so were the plugs. I specifically told the shop NOT to use Bosch. But they did. Screwy thing is, I went to school with the shop owner and he is a friend. (another thing to yell at him aboot)
I had a set of AC plugs already, and put them in. Cured the problem.
Moral of the story, don't use Bosch Platinum! Less than 20k on them and they f^^ked up!