I have an 88 300E w/ 200k miles. The idle has been quite rough for about a month now. It will happen when the car is stopped regardless of gear (P,R,D) after it warms up. The car will shake and from the outside you can see the muffler shaking. The rpm's won't move much and will stay around 5. The oil pressure will move between 0 and 1 1/2. The fuel economy will move half way towards the red and will move a bit in both directions along with the oil pressure. Once I give it gas and the rpm's go above 1 it runs fine. I have been getting about 16 mpg since this started. It has new plugs, wires, and filters. Can you suggest something before I take it to a mechanic.
Thanks a lot for any help

This could be anything. Just take it to the tech and allow him to do what he is good at.
Sorry, no miracle here.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Could be a big vacuum leak. The car is old enough to be entitled to brittle, broken vacuum hoses. When I pulled the head on my '89, I had to replace most of the neoprene hoses and some of the polyethelyene tubing. It was brittle and falling apart. The shaking engine can't be helping.. Just my $0.02.

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Jeff L
1987 300e
1989 300e
1987 BMW 325