You have certainly done a lot to your car. Your head gasket job was done very well with attention to detail.

Have you checked for any DTC codes?

The next thing I would do is:

1. Test the fuel pressure
2. Measure the EHA Current
3. Test the Throttle Position Sensor
4. Test the Air Flow Potentiometer

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible