I just installed Autolite 605'* and MSD 8.5MM wires, everything seems to run fine while under acceleration but when im at a stop sign or red light, my RPM'* seem to fluctuate between 1000 and 500 and bucks a little, i did have a misfire code on cyclinder 6 but i fixed this problem and i do not have any codes anymore.. any idea what this could be, i am still using my stock coils ...

Are all your connections tight? Is/was a plug wire contacting the O2 sensor wires?

maybe a cracked insulator on a plug?

Do you have a OHM meter to check resistance of the wires?

Cyclinder 6 spark plug gap was almost complety closed but wasnt setting a code , fixed the gap and everything seems fine

congrats

:?:

If you hadn't found #6 to be uh.. "improperly gapped" I would have suggested turning off the AC. Many mistake the AC cycling and adding engine load as a problem .