Q: Misfire number 5 Mazda Mill. on 2000 Mazda Millenia

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I have a misfire on number 5 per code p0305 I have changed plugs, wires, distributor cap, gasket motor mount (front) and my care engine light is still on, My problem is that when I get between speed of 38-40mph the motor feels like it's shaking (very bad) after I get up pass 40mph or below 35 it smooths out, it does this every time. I have done a lot of work to this car with not true results, Can anyone help or have any suggestions. Thanks
(1) Answer
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Look for a vacuum leak at the manifold and if possible disconnect the vacuum hose (if applicable) and drive the car. On a lot of Honda and older Nissans all the EGR gets diverted to one cylinder as ports in the intake clog up with carbon diverting all the EGR to one cylinder causing it to misfire. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate