M103 300E runs like crap. And I'm out of ideas!

[tbomachines]

My 300E developed a problem early last summer where sometimes it would misfire at lower RPMs and stall out. It idles fine, but the moment you put the engine under load (i.e. going from park to drive), the RPMs drop, it begins to misfire, and eventually stalls if you don't put your foot down. Then, after starting it back up again it will misfire on the startup and immediately stop the rotation of the engine (like a preignition or something, not quite sure). I think I've tackled all the usual culprits. So far:

- replaced ovp with new unit
- replaced cap and rotor, just inspected them again today to see if there was anything wacky there...cap had some usual corrosion on contact points but nothing out of the ordinary
- replaced wires, checked again for arcing today and nothing
- replaced EHA (was leaking wildly, had to be done anyways)
- checked engine temp sensor, appears to be fine
- checked the flywheel crank sensor (which goes to EZL), came out to 880 ohms, which is well within spec
- replaced O2 sensor
- fuel pump is always on during this so that rules out FPR
- replaced spark plugs (proper style - ordered from here)
- checked vacuum connections, seems fine

Today before I started it (it had been a week or so), I replaced the EHA and in doing so I checked the MAF plate. It did not spring back to the top but stayed wherever I pressed it to (and I had to pull it back to the top). However after starting the engine and having it run like crap, I checked it again and it sprang back up to the top--so I don't think that is the culprit.

Also this is completely intermittent. After it ran like crap today, I shut it off, let it cool down a bit while I checked the cap, rotor, CPS, and wires. Started it back up again with its temp roughly 40*C and continued to run fine as if nothing ever happened. Shut it down and started a few times and it was still good. I hadn't replaced anything in between these two times I had it running, just disconnected/connected the aforementioned things.

Emissions test for this bad boy is er....tomorrow. I need to get it so I know it will not stall out on me on the way over to the testing facility or worse run like crap on the wires.

Any thoughts? I checked the duty cycle not too long ago and it looked fine...I am going to check it again now but I don't suspect anything to be wrong since it was ok before.