Every m96 I've driven seems to come alive between 3500-4500 and falls flat after 6000. There does seem to be a bigger jump in power at the 4000 mark with my 996 intake 2.7 rally car than with my 3.4 street car. I don't think it takes that long for the computer to learn and adjust. I have to disconnect the battery on my rally car at the end of the day. Every time I reconnect the battery, the car idles weird for about five minutes but seems to run fine after that. I don't know why you're feeling a jump sometimes and not the other. Aging fuel pump?
The building is going up pretty good for an old man working by himself. I start on installing the sheet metal tomorrow.
