capn, thats what mine was doing. I also got this when i lost the eha current. But after adjusting the fuel mixture allen the problem went away and I get nice eha and duty cycle numbers. Still have the stall on acceleration but the electronics work.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)