[Porsche968CS]

My ’93 Coupe started to suffer from rough running. The problem occurs only at low RPMs (850 - ~ 2500) and when not on full throttle. When I accelerate hard the car performs fine. There’s no difference in behavior when the engine is either hot or cold. If I open the throttle very slowly the engine misfires till around 2500 RPM but seems runs fine at higher RPMs.

What would be the best place to start troubleshooting? <acronym title='mass air flow'>MAF</acronym>, distributor, spark plugs or can it be caused by something mechanical? I’ve verified the timing of the balance belt which is fine. Any help is appreciated.

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[banditsc]

What is the condition of the hall sender on the back of the distributor?

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[Porsche968CS]

I've replaced the connector of the hall sender a couple of months ago (was still running fine after). Is it possible to inspect the sensor itself? I assume that if the hall sender is bad this results in a fault code?

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[banditsc]

Sometimes it will trigger a code and sometimes not. I don't think you can really inspect it, more of a replace thing. I had symptoms like that and it didn't throw a code until after about a thousand miles and it gave a intermittent code for the sensor. If it doesn't fix it, you will at least have a spare for that fleet of 968's you have.

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