My car is still not right, it seems to be missing some and just doesn't run well. I'm still planning to check the injectors once I figure out how (as per deserts suggestion)

But from all the research I am doing I keep seeing about the EGR ports needing cleaning... Is there any way to really troubleshoot this? My guess would be that the car would run good if the valve was in one state and then poorly when in another. I really want to be sure this is the problem because I don't really feel like drilling into some plugs and tapping them to pull them out, sounds like one of those things that would turn into a whole weekend and probably costs a fortune at the dealer...

So, before I start messing with the car tomorrow I need to know how to diagnose the EGR system and I can't find any info on it...

 

Typical EGR ports plugged up will cause a lean burn miss in the range of 1500-1800 RPM under light throttle.