Engine Exhaust System problems of the 2005 Saturn Relay

I have a problem with the abs/traction control light coming on and the braking system will not opererate properly. There has been a few times where the brakes will not stop the vehicle properly or have locked up a couple of times. We also had to replace the egr valve do to a code 0414/0414. We also had to replace the pcm because the system locked up and deleted all the codes causing the engine to fail to start while tring to update the pcm to recognize the new egr. I also have proplems with the lights flickering and dimming all the time. These problems exist every day and I feel the vehicle is getting unsafe to drive. I have contacted gm several times and took the vehicle to a local dealership to get the pcm replaced. They would not give me the old pcm but I have the original delphi egr valve. Gm said ththat the 2005 Relay has recalls on the egr and pcm but my VIN was not affected and refused to pay any on the repairs or pay to have the van checked out at a gm dealership.