Just put a head gasket on this vehicle besides the average issues with this had no problems. accept the plug going to the air pump broke put it back together. do not know if having these wires reversed will cause this problem or not.

At 3000 rpm it stops pulling and starts bucking or surging if i let off get below 3000 it will pull hard up to 3000 and starts ll over again. any ideas..............

It may be that you are running the original engine wiring harness and disturbing it to do the head gasket made it fail. MB used biodegradeable insulation for the harness and all wiring therein. As a result the original harnesses all have to be replaced.

That's just one idea.

__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

In park if I rev motor to 3000 rpm it feels like it has a rev limiter on it. like on our race car. I am lost

In park, it probably does have a rev limiter. The older 124s did.

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

I agree it most likely does have a rev limiter in park. However it shoud not have the same problem at the same rpm in drive.........

Ok checked the code with the on board button got code 20 and code 23. Vehicle speed signal not present andintake manifold pressure with engine running to high or low? Now what?

When the wiring harness is bad it will throw codes. I'd get under there and check out the condition of the harness. It will tell you you need this or that but really it's the harness. THE HARNESS.

Rule it out first.

__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)