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i had a similar issue with fouled plugs that got progressively worse. Long story, short. It was a bad fuel damper. Simple test is to disconnect the vacuum line located on top of the damper and see if it has any fuel or smells like fuel (note: it should not have any fuel ). if it does, then you have a tear in the diaphram inside the damper and it is allowing unmetered fuel into your intake manifold. The DME is now trying to compensate for the extra fuel and your car is running bad.
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