It would still be a good idea to check the regulator, especially if you're a fairly new owner and don't know how old the regulator is. Given that your IP is fly by wire, voltage variations could be causing your bucking problem.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970