you didnt double gasket it did you? that would allow boost to read to your ecu......it will only fit on one way so you couldnt have put it on upside down, was the missing link brand new?. if it wasnt it might be dirty,....sometimes mine will get dirty and read boost and itll throw the code and the car will go into open loop and run rich as hell, ill take it off, clean it with brake cleaner and lots of grime will come out and then it will be fine, if your using an afc if you have too much fuel taken out that could also be it, too much correction will throw a code also....also, you could just straight up have a bad map sensor........also did you read the code, what is it?.......