2005 997 S Hesitation acceleration flat spot

I just bought a 2005 997.1 S. The mileage is high but the car has full dealer service records and the engine has no abnormal noises but when driving off immediately after cold start under light acceleration there is a bad hesitation / flat spot. This only lasts during initial warm up between approx. 1800 - 2500 rpm. shortly after warm up all is well and no issues.No lumpy idle or misfiring and no CEL illuminated at any time and engine starts no problem. The issue will not occur again till another cold start. I.e. overnight parking. If I let the engine warm up for 10 minutes before driving I don't experience the problem.

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[Casey at Pelican Parts]

Sounds like a fuel pressure problem that is being compensated by the DME when warmed up. I would check faults, and check fuel trim values to see if the car is running rich or lean.

- Casey