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1991 965 Rough Starting idle

Engine

Vehicle Information: Year: 1991; Engine (Size, Modifications): 965 Turbo; Total Mileage: 55,000;

Car has rough idle at start. Previous posts indicate a number of items including fuel check valve and fuel accumulator...I have not had the fuel system pressure checked, but none of the posts I viewed have this refinement: engine starts on first bump but idles at very low idle and will shut off with anything other than the slightest tap of the throttle. The idle is very low and just registers on the tach for about one minute until it starts to increase slightly. Between one and two minutes it will noticeably stablilize, but will not get to the normal idle speed at almost 1000 rpm until after about 5 to 10 minutes of driving. After that, it has a very stable and confident idle and throttle response going off idle. Also, a noticeable power loss is observed at almost precisely 3000 rpm when under very light acceleration. This is not noticed with a more agressive throttle input. It does not miss or stumble; it's just that you feel a drop in power as you accelerate lightly past 3000 rpm, regardless of gear. Thanks in advance for any feedback in this regard.

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