Ok well its been a while now since i did a tune up to my rig, and it still feels like it has slightly rough idle or almost like it has a slight misfire, things iv changed when i did a tune up are:

new air filter
bosch platinum+ plugs
MSD plug wires
new distributor cap
new rotor
I also cleaned the Throttle body, aswell as the IAC.

When I changed the plugs out the old one in cylinder 5 looked like crap but i just checked it and it looks fine, its been 3000 miles since i installed everything. The only codes that its throwing is po138 wich is o2 sensor bank 1 sensor 2 wich is the one right after the cat. my rig runs completely fine when driving, a mechanic said if it doesnt bother me than i shouldnt worry about it. it idles at the line right under the 1. but if you watch the needle you can see if move up and down slightly, dunno if this is normal or not. any suggestions on what it could be? i plan on putting 703 injectors in and hoping maybe that would smooth it out? not leaking any fluids (that i can see) beside some oil from the valve gasket and i beleive i have a slow coolaint leak somewere.

 

that idle sounds pretty high. is it consistently missing or does it seem random? if you unplug the wires one by one, replacing each wire after listening, do all the cylinders affect idle the same or does one not affect idle much?

 

sorry I dont rlly kno wat u mean by this part