I get a misfire when aproaching 4000 rpm. Its worse when accellerator is floored. I've put in platinum 4+ plugs, new dist cap, rotor, fuel filters,air cleaner. Timing belt is good. Distributor shaft has no play that I can feel. Doesn't burn a drop of oil. 270,000km. How can I narrow it down to fuel supply or ignition problems?. How many lbs pressure should I have after the fuel filter. I've owned this car since new and accelleration has never been 100% smooth.
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