I have been having a slight shuddering/vibration under acceleration..the first time it happened the CEL started blinking and it ran rough..than a few mins later the CEL went off and it ran fine again. i did notice some shuddering still. only under acceleration. and maybe its my imagination but i think the engine is a tad louder than it used to be..more clicking. but still could just me. i did replace spark plugs after the incident..still runs the same. so im thinking coils or injectors. i know how to replace the coils..but injectors..is that hard?

 

Might be a dirty or partially clogged injector. Try using a top tier gas retailer. Check the website out too see what is your neighborhood.

 

top tier gas retailer? i dont know what that means but i do always use a popular brand of gas (BP, lukoil, etc) and all I use is premium.

 

http://forums.maxima.org/showthread.php?t=560555

http://forums.maxima.org/showthread.php?t=560345

 

I don't think injectors are your problem. Coils, yes.

 

Here ya go. Check this out: http://www.toptiergas.com

 

so a bad coil(s) could cause this vibration under acceleration and not push a CEL light? i have checked for pending/stored codes and nothing.

 

and just to help..i think ive eliminated the things like bad axle etc causing the vibration because it suddendly started doing it when the engine missed that one time (read my 1st post above)