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How many miles on the engine? Injectors? Spark plugs? ignition components? Running low grade gas is not good for the engine. Fuel pump age? Temp sensors? Air filter? There's a lot of things that can cause a poor idle on a gasser. Check for vacuum leaks?
Its a 420SEL, there's no S420 in 1989.
Retired with no money is not Obama's fault, its called poor planning or living beyond your means. Blaming others is always easier.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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