multi cyl misfire 1 of 1

Question

have a p0300 code on prevouis codes where po420 and po430 replaced left and right cat converters cleared those cat codes no longer have cat codes but still have p0300 checked fuel pump pressure 51 pounds checked coil resistance all in same parameters1.50 1.60 etc engine has a miss replaced spark plugs is somewhat better but still have miss and loss of power when accelarating at whits end still feel it could be coils checked plugs again not fouled can feel all injectors firing
help thanks
bob caputo

Answer 1

replace the spark plugs with FACTORY spark plugs.