I just recently purchased my srt-4 (350mi ago). When I got it, the at idle, the vac was 18. Since then I tightened the IC clamps and added a $20 CC. I noticed yesterday that at idle the gauge was at -13 (no A/C). My question is this, is this a problem that can be solved by reseting the PCM, or is the gauge starting to take a shit like others have had, or is it just the PCM adjusting? What about a difference due to the CC? I did a bit of searching, but nothing really addressed this point. It seems that there is a bit of variatio in what others gauges read at idle, so it may just be that. Thanks for the help.