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Rough Idle and loss of power

Engine

Vehicle Information: Year: 1997; Engine (type, size, modifications): 2.5; Total Mileage: 52500; Transmission: Manual;

Follow up to yesterday's question about loss of power and rough idle. It seems like the car is miss firing or lacking oxygen. I took it to a local independant porsche mechanic today. The diagnostics showed 4 fault codes. One related to the emmissions control and three related to cylinder 2. I think they were 65, 72 75 and one other. This may have been a shortened version of what was listed (don't they usually have four digits?). The mechanic thinks it may either be the emission control, or coil. He said he does not think it is an oxygen sensor. He will check the emissions control and coil. If nothing there he said he will need to pull the spark plug. If he can not determine from there, he said he may need to take a look at the cylinder.Does this sound like he is on the right track? Also, pricing seems fair. He said the diagnostic test and his time would be about $75 and another $75 for the further investigations. This seem very reasonable to me. He also took the time to talk to me about the potential causes and what he would be doing to find and correct the problem.Any feedback you can give me would be most appreciated. This is my first Porsche so I don;t have experience with these cars.Thanks

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