Fuel pump running, engine off, 60 to 66 psi.
39-=43
You probably have a plugged fuel filter. See if you can put a fuel pressure gauge on the fuel supply line at the engine and check your fuel pressure. It could also be a fuel pressure regulator
It means to check the fuel system fuel filter fuel pressure O2 sensor(s)
Your fuel pressure drop could be do to a clogged filter, pinched line/hose, or a weak fuel pump. You should have around 35 psi at idle and 43 off idle. I hope this helps answer your question.
Straight out of the FSM :at idlewith vac - 34 psiwithout- 43 psi
43 PSI with engine at Idle with Fuel Regulator vacuum line disconnected and plugged.
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knock sensor
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41 to 47 psi
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running 26-35 off 37-43 and it dont matter if its a dohc or ohv.the pressure is the same.