Keep in mind some mechanics won't even attempt to diagnose driveability problems on your model until the engine wiring harness is replaced. The wiring harness can easily be the cause of the problems you're experiencing. Even if it doesn't solve your immediate problem, the money won't be wasted.... it'll preclude niggling and perhaps serious problems in the future.

It's not a difficult DIY job. If you don't rush, it should take you 2-4 hours to replace the engine wiring harness. Just lay out the new part over the old under the hood and start swapping connectors. The part will cost roughly $800-900.

Please replace it.

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95 E320 Cabriolet, 169K