I'm a friend of Bryan @ Vintage Benz (he said to say that!) The EGR valve has been checked by Frank @ Franks garage in Lansing. He only does Benz work. EGR valve was cleaned along with pipe. Solenoid is working, EGR is ok, vacuum is good. He zeroed code, but came back. Car bobbles on excelleration intermittently. Don't know what to do next. Any ideas? Frank has the car right now but it's not doing what I experienced. Check engine light back on and same code. ???

Thanks guys now I feel like an ass because I was talking this forum up saying how questions get answered nearly immediately.....

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Current vehicles the wife and I are restoring:
1966 W111 230S - near completetion
1976 280C - the wife's toy
1981 300SD - is already a beauty

Are there any codes?? Possibly a code for a EGR malfunction?

EGR can cause idle issues & off idle issues but rarely anything else.

Has the car been serviced??

Spark plugs should have been replaced at a max life of 5 years regardless of mileage.

The fuel filter controls fuel pressure, has it been replaced?

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