today we took downpipe off thinking the cat might be clogged. still had the same problem. then we took the tubing that goes from the pcv to intake manifold off. there was no vacuum but the air was coming out instead like the exhaust is all backed up. we are thinking that the egr valve may have failed and is blocking the airway so exhaust is going back up the intake. also on my ecu we checked the ground lines and to of them were bad. we just used conectors and made a new ground for the two wires right by the ecu. still not any better except now the car fires up a lot easier. then again the battery had been getting lower and we have had it on the charger so that might be part of it as well. anyone have any stories about when there egr went bad like how did it act??? i wont be able to work on the car again until monday thanks for any ideas