I replaced a number of items just from reading....This is my first car (I'm 20) and I didn't know a whole lot so I just replaced alot of stuff for a general tune up along with others that could be potential culprits.

I have pulled each spark plug individually and they all equally cause the car to miss harder. Resistance on all spark plugs are perfect (I double checked it even though I bought a new set).
I believe my dads DMM has a IR temperature sensor on it...will that work good enough to test the injectors via the manifold as you suggested?

Also...Is there a way to reset the EHA to its original setting? I kinda fiddled with it a while back and I lost the position where it was originally set at. I checked the MB CD's, but it only mentions replacing it...nothing about testing it. I understand it is a very critical part to maintain a stoichiometric ratio (this is not my misfire cause though because I both richened and leaned it out a long time ago to see if that was the problem). If the EHA was a problem then it feel as if the car is starving for fuel...not a misfire, correct?

Oh and yes I've ran Seafoam through her.

Thanks guys!

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k