Hi there.. I have got a 99 Grand Prix GTP 3.8L supercharged.. Car ran fine no Check Engine lite no problems and completely able to bury the boost gauge in the dash at any given time.. Then the transmission messed up.. So I pulled the motor and trans.. split them and got the trans rebuilt and put it all back together.. And it ran and shifted great! Happy Fat Kid!! Then one morning shortly there after it started to idle funny.. still no check engine lite.. but it has about 170K miles so I dumped in some stp fuel injector cleaner and sprayed in some throttle body cleaner.. and yes I used actual throttle body cleaner not the carb cleaner because I have seen that anger them in the past.. Anyway.. this is where it gets crazy.. now I have a check engine lite that first said MAF low circuit input voltage.. and now to add to it I have a P1676 Code which is for the purge cylinder.. which is brand new.. also the MAF is brand new.. unplugged the MAF with the key on and measured voltage and its dead.. I know for sure its not the sensors and I cant seem to find any bad wires.. Also now the thing will only build boost up about half way on the gauge in the car.. Am I missing something obvious?? I am running out of ideas here and any help would be much appreciated!!