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Q: What can I do to fix this problem on 1999 Ford Expedition

Got a PO353, PO356,PO358 after changing all Spark Plugs and all Coil on Plugs, also getting misfire when gas pedal is released
Starts up fine
Checked connects look okay
Checked spark plugs look okay
Checked wiring
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rec. fuel system clean. ethanol treatment to 1 tank premium fuel. get fuel running through clean to eliminate fouled injectors as possibility.
I also cleaned tank and lines, also new injectors,new EGR Valve, Trottle position sensor, EGR Position sensor, ICV what else can be done
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