Its my understanding that dropping the fuel pressure on a CIS-Basic actually increases the amount of fuel delivered. The fuel pressure is what "holds the door closed", so its opposite of what you would think.

I suspect that the fuel pressure is dropping during the pull (plugged filter, weak pump, cruddy warmup regulator) causing it to dump more fuel in. I have some really nice pressure transducers that I've been itching to use on the dyno, we just need to work out the plumbing

BTW, you Porsche guys drink a lot of

Kendall