This whole thing sounds like BS to me. The only way the parts of a car could rust and stick together to that degree is if it was a flood car. Maybe the water went up to the floors for a few days. Either way, at an average of 3 months per car, you're way over your time with this one. Go sell it to someone who cares about fixing it and call it a day.

PS, I love my 4.6is.