This is not a shudder -- as in vibration related. This is engine momentarily loosing rpm and power, causing a jerk, or a sequence of jerks. Happens in park as well as drive. It is like the engine starts choking up whenever there is demand for power during acceleration - especially around 1800 rpm. Once above 2200 rpm, it again runs smooth. The problem is not repeatable and I have not seen any corelation with outside temperature or humidity. It is intermittent - pretty bad one day, no problems the next day. I do see that it becomes worse when I put 89 octane vs 91 octane gas.
I am thinking it is either a clogged fuel filter or a bad injector.
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92 es300, I have a similar problem, only in drive when stationry or when just moving off, happens intermitently and seems to be getting mor noticable this last 8-900 miles. Again no problems once at speeds above 10-mph