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You could take a look down the spark plug hole with a borescope (they’re now so cheap and Bluetooth equipped) to see if there’s anything obviously, but I also think you’ll need to at least do a top end teardown to be sure.
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84 Targa (sold)
70 914-6 (sold)
73 914-6 2.7 conversion (sold)
75 GMC Motorhome (sold)
2016 Cayenne
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