My gfs 99 Maxima with an AT, shudders/shakes sporadically while in idle(not in park, or neutral) and when excellerating slowly (not if you "step on it") Last yr she had a bad fuel injector replaced, 3 months ago i replaced all 6 spark plugs, and had an alignment done. both the plugs and alignment helped some, but it has gotten worse since then....SOOOOO, should i replace all fuel injectors? or what else can i do? Please help.

 

Our 99s are notorious for bad ignition coils. Start there.

 

ive had what sounds like the same problem. I replaced spark plugs, boots, CPS sensor, my brother (12 year nissan mechanic) says TPS sensor. havent replaced it yet because the mounting screws are all fd up. ignition coils is not what I wanted to hear. Fixing the things that I have has cut down my shutter 80% tho. oil change this weekend, who knows when the last time this car had that done. Hoping that will take up some of my issues.

 

might have air leak on a hose

 

Ignition coils...you don't have to get 6 new ones....just let her idle and pull the coils one at a time...there will be like 1 or two that don't really seem to change the idle quality...those are the bad ones.

In other words..pull one coil. If it idles like **** immediately then put it back let it idle morfe. Pull another coil. The coil that has the LEAST DISCERNABLE EFFECT on the idle quality is your bad one.

 

i'll get to wrk thx you guys. i'll keep u posted...pun intended

 

hate to hijack...thanks!

 

Vise grips.

 

i'm just going to drill it out and and replace the screws with socket head cap screws. I have a never ending supply of nuts, bolts etc. at my disposal.

 

IACV is going bad and you should get a code once it finally dies. EIther that or you have a hole in the hose