mercedes 280se problem

I have a mercedes 280se year 1980 M110 German. It was perfect until last week. The problem is that I can't reach 60 Km/h. I've checked the fuel pressure, leaks in the intake manifold, vacuum
leaks and everything is fine. Do you have any idea?? Thanks
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Check accelerator linkage travel - that (with engine OFF) when accelerator is floored the linkage on engine hits its full throttle stop. If it doesn't a broken motor mount could be the reason.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.