Misfire in cylinder one po301 code

1997 MERCURY COUGAR
8 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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MRFANTASTIC49
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I started getting code po301 and sometimes code po303 cylinder misfire. I changed the spark plugs wires and ignition coil and last rotated the fuel injectors. still I cannot get rid of the misfire in cylinder one po301 code. I am stumped. any ideas please?
Nov 27, 2017 at 8:25 AM
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MHPAUTOS
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Check compression's just to make sure that there is not a problem there. also, check for a vacuum leak around the manifold and check fuel pressure and if all these are okay, get the injectors flow tested, start here.
Nov 27, 2017 at 9:17 PM