hey whats up, Im new to these threads and my bad for making another thread about this but Im losing my mind reading all these posts so I am going to explain what Im going through if anyone can help please.

I have a 2002 maxima SE 3.5L engine with about 114,000 on the dash. Recently my car started running rough and I got a P0306 code so I replaced all 6 plugs with NGK Platniums. I also had oil in 2 of the back plugs so I replaced both front and back valve cover gaskets and replaced the IM gasket. Once I was done I started my car but still was running a little rough and ended up with P0300 code. Car is idling below 1000rpms but if I keep the rpms above 1000 it will stop shaking but still feels like its running a little rough, shaking also gets worse in Drive or Reverse. Ive been told so many different things such as coils, MAF sensor, IACV and etc I also checked if there was any leaks from the Intake Manifold but theres nothing I can find.....I can not afford to go on a crazy spending spree fixing everything until it stops so I am trying to get more of a better idea of what it may be or what to check and how to check it before replacing. Im also getting very poor gas mileage like 13mpg city. Car seems to have no ***** what so ever on the highway. Im going crazy dealing with this so any help would be great. If your telling me how to test something before replacing please give me steps on how to check. I can get access to most tools and I have a digital Multimeter if I need to use that to check anything. Thanks

 

I'd start by looking up the code, here http://www.nicoclub.com/FSM/maxima/ you want EC.pdf

 

P0300 is a misfire I believe. P0306 means it is cylinder 6. Replace that coil.

 

Coils. Had to do the same thing. Replace all your coils. Kind of eexpensive @ 76.00 ea coil, but its worth it. It will fix your issues.

 

No need to replace them all, IMO. If money is tight just replace what is broken.

 

do what 2damax says. You probably want to go OEM. Used ones work too as long as they aren't bad.

 

Here is more information on coils >> http://forums.maxima.org/5th-generat...ow-w-pics.html