88 pathfinder idles rough.Please help
 

I need some help!I have a 1988 pathfinder SE 4 wheel drive V-6 and it idles rough almost like a miss when it warms up..but when im driving it it runs great and still has all its power...I have tried to check all vacuum hoses and have found nothing..Im an old fashioned chevy and pontiac guy and really need help diagnosing this problem since it is my main vehicle and my wife has a 1987 stanza i need to familiarize myself with these engines.....Im new to the foreign vehicles and to this forum and i will be any help i can and will appreciate any help i get
I have recently had a starter,valve covers,and an alternater put on...and also have put on a new fuel filter,plugs,wires,cap,and rotor button....thanks