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I have a problem with exaust fumes on 1996 Volvo 960

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my volvo 6silinders after warmup it gets slugeged and smelly with unburnet exaust fumes, Ireplaced two bad ignitors but the problem remains with a little un known vibrant with the engine?
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(2) Comments
change all spark plugs to premium plugs, upgrade ignition cables or coils to performance type(accel's), upgrade air intake to high air flow type(K&N). TREAT FUEL SYSTEM with stab-bil ethanol cleaner. your cats do not control exhaust burn but act as a filter. use high grade oil. your engine is not burning efficiently.