My friend changed his clutch a few months back. After the clutch install he's had a cel. I read the codes with evoscan. There were a ton of sensors coming up, egr, something about the fuel injectors, tps, etc. The car builds boost really slowly, and flutters really bad when it gets to about 19 lbs of boost. I looked for boost leaks, disconnected hoses etc and didn't find anything noticeable. I am assuming that something happened during install. Can anyone help figure this out? Thanks in advance!!