On further research this looks like a coil issue. Am I off base and is there an easy way to test this? I also found some discussions about the air mass potentiometer, please tell me it is not this!

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Martin Ingram
Colorado Springs
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)