Well today I swapped MAF's, the old one is back in the car. Drove it 3 miles (to the post office) it ran like it did before, smooth but only at 75%. Thought I could feel some boost but it still hesitates. shut it off, in Post office 10 min. Upon return it started right up and idled ok. When I started to drive it began to misfire horribly, as it was before. The same hot start symptoms I had before. The trip back peaked at 30mph. There are times when it seems to be missing on two or three cylinders. Its very rough. What could make an instant change like this? Any way, got home and pulled the codes and a new one popped up, P0300 (there's a surprise) and the standard P0100. "Multiple cylinder misfire" according to M.B. Doc there are only three things that can cause this. Heat, new plugs and always wait past time to start. Compression, it runs ok sometimes and really bad others, don't think its compression. Lastly, injectors, a poor spray pattern will trip the code. Hmmmm. But why only after a hot start? I am thoroughly confused and confounded. Any more suggestions guys (and gals)?
Some random thoughts: CPS? Injector timing (is it variable?)

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K