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SOLVED
This problem seems to be this little documented check valve, A 000 476 37 32 AND/OR line A124 470 95 75--
Both of these parts are highlighted in the pdf and photos.
I changed all the clear lines anyway, but they weren't the problem, with the old line and valve in place, it still created an air bubble in line 32 within 20 minutes and the rough run was still there.
Checking the check valve, and I discovered it to be inoperative. Further investigation of the 606 engine manual, denoted a mod to the return line from the filter to the rubber line that connects to the hard line to the tank "For improved starting."
Apparently, the hose and non-return valve prevent air entering the low side supply from the top of the filter and the tank return valve.
See the next post for parts lists and EPC images.
Last edited by markg612; 02-06-2010 at 12:44 PM.
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