I would seriously consider the ignition system. I had the a similar problem but it consistantly stumbled on acceleration from start. I rebuilt my fuel system injectors, seals, idle potentiometer, all the rubber, throttle switch, O2 sensor and OVP. However, it was not until I did the coil that my stall on acceleration was fixed. It was a good experience and my rubber needed replacing as did the injectors. But, it was pretty frustrating doing the fuel, which is alot more expensive and labour intensive for me as I was learning along the way, than the ignition with the exception of the EZL.
m

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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)