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944 Random Engine Hesitation

  • 1984
  • 944
Mileage: 
65 000
Engine
Lake Oswego, 
Oregon

First, thank you for all your help with the previous questions answered on similar engine situations. Here is the problem. The 944 engine hesitates about once a month. It is my daily driver. When the hesitation begins, I have noticed the occurrence during the morning, at acceleration from a stand still and continues for about 20-30 seconds. The engine is unable to move beyond 2200-2600 RPMS. The hesitation eventually disappears and driving resumes to normal until another month from now. I do have a Porsche mechanic and he has done the following:

1. Complete tune up (all plugs, hoses looked good or were replaced). 2. Replaced ENTIRE fuel system (fuel pump, filter, hoses, etc). 3. New oxygen sensor. 4. Replaced DME. 5. Cleaned TPS.

The fuel used is always the same brand and quality.

Is there any other areas that should be checked?

 

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