Not that I have ANY clue about how to tune the S/C....but I read a pretty interesting article a while back about how the problems with the S/C were related to the spead limiter on the 3.4L ECU.

The article was talking about how the speed limiter works by leaning out the fuel when the intake volume was at a certain level. suposedly some guy "fixed" the problem by stripping out the speed limiter in the ECU. There is a company out there that will do it....not sure what the name of the place is. and the author was pretty sure all the 7th injector and high pressure fuel pump stuff was now un-needed.

Like I said.....I know really nothing about the S/C...but the article was interesting