Still having a prob. with fuel cut. Car ran good for 2 days, then started leaning out after about 1/3 throttle. tried all obvious fixes (vaccuum lines, missing link, hose clamps, etc.) Today replaced FMU diaphram, thought for sure was going to fix, let car down, drove around the block, still same problem. Car is acting like FMU is not hooked up. But it is. Has anyone had this prob? How do I fix this?

check the voltage on your map sensor... it should be really close to 4.7 if it sees anything more, you should experience fuel cut...

the fcd or missin link may be clamped at the wrong voltage....

any CELs??

03 srt-4 13.130@112.47mph (n2o, stock turbo, 10/2003)
now: 20g, portfueler, bpu+++ (track/dyno times tbd...)

i farted on your wiki

found the problem, missing link is bad. right now running without it. Runs good up until about 5500-5800rpm, then there is fuel cut. Got VC2 (FCD) from Split Second, and used same power ground and MAP sensor signal wire as SAFC at the ECU and car won't run. Tried setting VC2 from 4 volts to 4.8 volts still throws code 14 at every setting. Can anyone give me a different wiring diagram?