Is number 5 spark plug located between the right bank and firewall?

SOURCE: Have misfire, scanned and showed 305 code. Cleared

these injectors are bad about clogging up, you can probably take it out and clean it and put it back in.

SOURCE: 2004 ford freestar 3.9lcode po305.replaced plugs wires coil and egr .still has code po305

Egr wouldn't have anything to do with it , not just one cylinder . Is the fuel injector firing ? Do you know how to test a computer driver ? ( transistor ) Injector Circuit Wiring Diagram How to test fuel injector circuit with basic tools open control wire

SOURCE: sound like engine have a misfire what all i need to check?

code p 0300 is random misfire and is more from
low fuel pressure , dirty injectors or harness wiring problems to the injectors than plugs
many car manufacturers know of the difficulty of accessing plugs on that bank so they installed platinum plugs which never need replacing code p 1800 refers to the variable intake air system
component description
The VIAS control valve cuts the intake manifold vacuum signal for the power valve control
It responds to ON/OFF signals the ECM
When the solenoid is off, the vacuum signal from the intake manifold is cut
When it is on the signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator
Performance indicators
loss of p[ower as the ECM is unable to modify the air passage way of the intake plemn
The valve is supposed to open just beyond 2-2.5 k rpm so that you get the power
otherwise , it modifies the air flow to achieve low end torque at lower rpm
The clip on the power valve is made of plastic and will deteriorate over time