I am the owner of a 89 420 SEL, the problem is this , when I drive the car all seems good from the first take-off but when I stop @ a light or slow to make a turn ,when I hit the gas the car loses power but does not shut off it kind of stumbles for a bit then power kicks back in
I just put new plugs in changed the oil the problem still remains
car has 168,000 miles and I have no maint. rec. all replys will be gr8ly welcomed
if anymore questions are needed just ask.

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420 sel 168,000 1989

try using fuel additive like chevron techron to clear up the fuel system. That helped in instances where I had this issue.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

Blocked fuel filter?

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1988 W126 420 SE

beware of fundamentalists!

my 86 420SEL was doing that intermittently...a new OVP relay for $88 plugged right in and has apparently fixed the problem.

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2002 Ford ZX2
2 x 2013 Honda Civics

What does OVP stand for? Where did you get yours? can you post a link?
Do you know the official part number?
Thanks. Sounds to me like the right answer.

I think the part # varies by model and year. Mine was a gray box with a red lid and a 10 amp fuse inside the lid on the firewall next to some other black relay boxes. I placed the order with my friendly Mbz parts dept at the dealership where I work, and they handed me one the same day. This is not a catch-all cure, but it has seemingly worked for me.

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2002 Ford ZX2
2 x 2013 Honda Civics