gtp missing and low boost
i have a 1999 grand prix gtp and i got a problem i cant figure out. First the */c coupler was bad and making noise so i fixed that and it ran good. The next day it started missing and hardly has any boost. So i hooked it to a computer and it said faulty wastegate. Is that the problem or not. Is wastegate the same as bypass valve or is that a seperate piece? I was told take off the */c belt and see if problem still occurs. I did that and it still misses. I Also hear it could be catalytic converter. was told to take out o2 sensor and drive it and see if thats it so guess ill try that 2marro. please tell me somebody knows what the problem is. It also pops up a light that says service engine. i know it needs o2 sensors cause comp. said so but thats not what im worried about. Please help and thanks for reading.