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Old 04-22-2002, 08:24 PM
400E 400E is offline
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Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Have you replaced the fuel pressure regulator? It's said to be a common source of rough idle. If you do, make sure you get the new and improved version from a dealership. It has a blue plastic piece at the bottom.

I'll be interested in other folks' thoughts as well since I too have a mild rough cold idle. (Replacing the fuel pressure regulator, rotors, and caps hasn't helped.)
'93 400E
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