He said he changed it...
So it still throws those same codes? That's odd. What year is your GTP? You might try to find someone with a compatible stock PCM or a tuner and see what is really going on. And just to see for myself...you replaced the MAF, Rear o2 Sensor, and the EGR? Ok...when you seafoamed the car did you run it through the brake booster or the actual gas/oil? If you ran it through the oil you have to go beat on it and then change the oil/filter...cuz if you don't...you = in trouble. Also...have you tried checking for vacuum leaks? Might be your issue...the bouncing tach while driving MIGHT be the CPS (Crank Positioning Sensor).
