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Premium Member
158 Posts
Here are my 2 guesses.
1 - fuel pressure regulator, if the diaphram ruptures, the vacuum line will suck gas, making everything rich, and maybe letting some slip past the rings. Check by pulling the vacuum line and there will be gas in it if its broken.

2 - A messed up fuel injector that is continuously firing. I dont know how to check this, but a post a few down talks about it.

Good Luck
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