Hi MB doc,

Many thanks for the reply...the car is a 190E 2.5-16 1990, and this is on behalf of a friend of mine...
The problem is that on full throttle or kickdown there is a kangarooing effect, in other words it lunges back and forth...Its difficult to explain...Call it a jerking effect, its like the power is cutting in then out, in then out...This causes it to jerk...The revs go up and down, up and down...If i let go of the throttle its ok...
Sometimes its fine...But most of the time it displays this problem...
I have been told its the governor for sure...but now i was told it could be the switch?
Any ideas please!
Many thanks

PS: How easy are either to change?