I have been having problem with my 850 after she warms up she starts to sputter and runs like crap. I have replaced the fuel filter, spark plugs, distibutor cap and rotor, changed oil and oil filter. I have check all the vacum hoses and I have no code on the diagnostic unit. I have added a little more premium fuel and this has made no difference whatsoever. I do not know what else is could be. I am not impressed I have only had this car for 2 months and I hope this isn't a sign of things to come. Any advice you guys could give me would be great.
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