Engine Problems of Porsche Cayenne

I own a 2005 Porsche Cayenne. Since owning this truck there have been numerous items that have gone wrong. All the main computers had to be replaced, front drive shaft, transmission, and now a coolant tube. The last item is my concern, which cost $2,800. 00 to fix on a truck that has 71,000 miles on it. When it was taken to the dealer I was told that all the Cayenne?s from 2003 ? 2006 have to have this part changed (it?s made of plastic), because it breaks. Now Porsche knows there is an issue with this part because it has recalled of the replacement parts that where on all of the dealerships shelves. After doing this there redesigned the and part made it out of aluminum and had this part on back order because there where so many Cayenne?s that need this part fixed sitting in the dealerships. I have tried working with Porsche but they just say that I?m out of warranty and there is nothing they will do! it seems to me that when they need to replace this part on all of its trucks there is an issue. Help!.

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Vehicle suddenly loses power ("throttle control" as the service rep puts it), usually while traveling at highway speeds. This causes sudden deceleration, creating issues for surrounding traffic. In each case if I floor the accelerator I can maintain approximately 25 mph to get to a side street, where I arrange for a tow truck. This vehicle has been in the shop three times for a total of a month, during it's first 6 months (14,000 miles) for this condition. Each time the Porsche dealer believes it has been fixed. Intermittent so hard to diagnose.

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