Ok I'm running out of ideas. I have an 05 WRX. Mods- 3" turbo back exhaust, cold air intake, catless UP, and turbo inlet. After I installed the turbo inlet I can barely get it to run. Once it fires it does the initial rpm rise as usual, then drops to maybe a hundred then fluctuates very rough or dies. My boost gauge shows normal 20 vac during the initial fire up the goes to around 10vac. I can only get it to stay firing for a about five to ten seconds. I have hose clamps on every hose and have double and triple checked everything. I even did new bpv and y pipe gaskets. I think it's a leak somewhere but I have no idea how to do the soap test if I can't get it to run. Any ideas, tips, or input would be greatly appreciated. Thanks for looking.