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That is a LOT of questions!
The code 6 in the DM (pin 3) is about a problem that has happened with the EC/CC/ISC computer (electronic accelerator) at some point. Since there isn't a code in the EA computer that code doesn't mean much.
Having a flat spot at a certain speed is condition that can be tough to find.
DO you use premium fuel? if not then the knock sensors can cause a flat spot.
Other than the MAF & ignition system, the fuel pressure regulator is the most common part to cause running problems.
The rear head-rest motors were problematic from the start on those cars..even a replacement part on the "Value to commitment program" back in 1993.
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