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My 1989 Mercedes 420 SEL runs very rough when cold but runs ...
Sent to Car Experts February 27 03:24 PM

My 1989 Mercedes 420 SEL runs very rough when cold but runs very smooth when it is warmed up. It passed SMOG when it was warmed up for 30 minutes. Any tips on what may be wrong?
Thank you,
Chuck Hamilton

Optional Information:
1989 Mercedes-Benz 420SEL 4.2

Already Tried:
Tune up and cleaned fuel injectors.

Customer (name blocked for privacy)
Status:  Closed   Value: $25
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