aerolithe

Good day all,

Since I have time to look at putting some love to my car for the season I put the car under the sun to look at some issue. First the battery was dead even with a Porsche maintianner.
Check Oil GOOD, Check coolant Good, Start the car and she fire right up YOUPi !!!!
Went for a ride and everything work except speedo. Check the ABS sensor and test OK on the front left. No ABS lights.
Remove the clauster to check for bad connection and everything look good.
Went for another test drive and now she is not running to good at low RPM like she miss fire and buckle until reaching 2000 RPM and after that everything good.
But on my return at the traffic light I got the light flashing saying cat to High!!!!!
What could that be the problem?
Could I just remove the catalyzer ?
Found clean oil in the V behind the thermostat hosing need to find where that come from. Maybe valve cover gasket?
The Speedo still not working !!!!

Hope every one will be save to still enjoying those nice car

The 928 is a 1991 automatic and I don't have acces to a Durametric