i had finish installing my turbo and dpfi to mpfi convert, and now having problem with reving over 3k and getting code 4, and im using smc to manage my fuel , the wierd thing is that, when i didn't hook up the SMC i can't rev over 3k but when i installed the SMC it can reach up to 5k but that was the max it can go to, and not getting the code 4 when the SMC is installed. any idea why isit doin that.

and one other problem with my vacum line when splitting up 4 way to boost, bov and things on turbo it will go back to not letting me reving over 3k, but when its back how the vac line is hook then its let me rev to 5k , sorry if its hard to understand what im asking.

 

repost, fyi your car is apos