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So many possible reasons......
Start off looking for vacuum leaks. Check injector O-rings and cups. Check the air distro hoses. Check the air intake plenum, and the ring seals underneath all that intake stuff.
Check your cap, rotor, and wires (actually might wanna do that first). Make sure that the injectors for those cylinders are working. You may have a dying fuel distributor (god forbid).
Lots and lots of possibilities. Start off with the easy to check/cheap to replace items.
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-tp
1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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