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The car ran excellent and didnt miss at all before i changed the leaky valve cover gaskets and now it has p0300 and p1800 codes and misses pretty bad.all coils have spark and i just replaced all spark plugs.i unplug cylinder 5 coil and theres no engine rpm change.could it be fuel or should i try checking for more leaks?it also has new kntake manifold gasket.im out of ideas

Vehicle: 2004 nissan maxima 3.5

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HI there

Swap the #5 coil with the one next to it and see if the misfire moves with it. If it does, then replace the coil. Even though it's got spark it's not firing that cylinder if there isn't any change.

P1800 is for the VIAS system. you might have unplugged the solenoid or the vacuum line and that could cause this code.

P1800 NISSAN - Variable Intake Air System Control Solenoid Valve Circuit

Read more: https://www.autocodes.com/p1800_nissan.html

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