Have two Grand Prixs. A 2005 and 2006. Bought both used. These are my 5th and 6th GP with the 3800 engine. So far, no intake manifold problems. Should I expect it? The 2006 has 67k and the 2005 has 98k. I found that I have a leak in the power steering in the '05 and they want $800 to fix. This common?