Okay so I got my 300zx a week ago and noticed that my engine will start to sputter and become weak after about 45min of driving. It will lose acceleration and if I try to go faster during this it will basically just stop moving forward. It runs perfectly fine before that. It takes around 5 seconds of cranking to start it sometimes so I am thinking it might be the spark plugs? Anyone had this problem before? thanks
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91 300zx engine sputtering after about 45min of driving - kmm300z14:47:42 03/22/15