Date registered: Jan 2006
Vehicle: 73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
Location: DC Area
Mentioned: 1 Post(s)
Quoted: 97 Post(s)
Hmmmm. I had the same jerking issue with mine. I found that my timing was off. First clue was when I turned on the AC, and the jerking would go away (turning on the AC advances the timing by 5 degrees).
Years later, chasing down a different issue, the mechanic I had wanted to rebuild or replace the guts of my distributor, including springs and counterweights. I never gave credence to the notion that stuff like that would go bad, but my car's never run so smoothly as it did after that.
Try advancing your timing by 5 degrees and see what happens.