misfires after running 20 mins

1992 MERCEDES BENZ 500SL
77,000 MILES
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TROUBLEMAN
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92 mercedes 500 sl ...rough idle...i changed caps plugs wires rotors..... pop pop through exhaust POP POP THROUGH EXHAUST AFTER 20 MINS RUNNING
Apr 21, 2012 at 7:42 PM
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