At 4K the engine begins to miss and stumble (similar to a rev limiter kicking in) as well as having 450-500 rmp Idle. Just replaced EGR valve. Fault code is 6 per the LED reader on the car. (the EGR valve cleared the 5 I had). Is this the ISC faulty code? If so, what part is it? I've searched the forum and can't find anything specific to the E420 on this.

There is Torque Converter 4K protection limit when car is in P or N..
Is that the condition?

That might be it. I have not run the revs up while driving since the initial check engine light came on for the EGR valve. I'll try winding it out a little next time out.
Thanks

Have any help on the 6 flash code?

Jim's site has a lot of info on codes. http://pages.prodigy.net/jforgione/MB_DM.html
How many miles does yours have?

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09 Jetta TDI
1985 300D

Has 147K with the only trouble being this and a broken rear shock(one really big pothole!)