I recently put my 99 STS in the shop for repairs. I was having a problem staarting the car. The dealership ran a diagnostic test and said that my "A" and "B" crank sensors needed to be replaced. They also said that my plenum gasket needed to be replaced. Well I got everything that they said need to be replace, replaced. I get a phone call later from the dealership saying that my upper plenum has a hair line crack. Has anyone heard of this problem or know of any other solution?:helpless: