DWP

Got a CEL and no boost a few weeks ago, so I pulled the codes and cleared 'em. Ran fine for a couple of weeks when it happened again. Here are the codes:
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Control Module Part Number: 4B0 906 018 CH
Component and/or Version: 1.8L R4/5VT G 0001
Software Coding: 16701
Work Shop Code: WSC 63351
6 Faults Found:

18057 - Powertrain Data Bus: Missing Message from ABS Controller P1649 - 35-00 - -

16684 - Random/Multiple Cylinder Misfire Detected P0300 - 35-10 - - - Intermittent

16688 - Cylinder 4 Misfire Detected P0304 - 35-10 - - - Intermittent

16686 - Cylinder 2 Misfire Detected P0302 - 35-10 - - - Intermittent

17536 - Fuel Trim: Bank 1 (Mult): System too Lean P1128 - 35-00 - -

16804 - Catalyst System: Bank 1: Efficiency Below Threshold P0420 - 35-10 - - - Intermittent
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So I STFA and logged blocks 118 and 204 and 002. MAF readings not so great, so I cleaned it and logged 'em again. No improvement. BTW this is a 2nd gear pull, and I know the advice is to do a 3rd gear pull, but it's tough for me to do that safely here.

What to do now? Here's the latest log:
<img src="http://pictureposter.audiworld.com/1043/log002.jpg">

Silver Streakin'

cat bank 1 could be the front O2 sensor.

and leaning out could be the L hose or the suction pump thingy next to it.

could be MAF causing issues.

sorry, I'm terrible at reading codes and diagnosis. I just look around for the broken stuff.

search those code numbers in this forum only and see what others have found.

DWP

I can't understand why it is infrequent intermittent. And seems to have no relationship to how hard I am driving. First time was a day after an HPDE, but the second was just driving around town.

DWP

New MAF cured it, and the car pulls stronger too! I did try cleaning the MAF (several times), but that didn't help. My indy mech tells me that cleaning often doesn't work.