problem with a car

[docweld]

I do not know if I can ask for help in here for my 1993 Nissan sentra, but I am at wits end here. I hope someone can help me with this.
so here I go, 1993 Nissan Sentra XE 1.6L 5 speed 106,000 miles.
The car sat for 4-5 years then last year did the rust repairs and brake lines and put it back on the road with that said I put new plugs, cap and rotor and it ran great!!! 38mpg around town lots of hills. 3 months later it started running ruff when it warmed up, (no power and sounded like it was running on 3 cylinders) untill I got the rpms up. I finally found that 1 of the spark plugs was bad ( the center separated from the metal) replaced all and it ran great again. 2 months later started to do the same thing again, finally just changed out the plug wires and it ran great again. 2 months later it is doing the same thing again............
now runs fine when first start in the morning cold, once it gets to temp is starts missing really bad I checked every thing I can think of but do not know what to do next.
any help would be great!! I can give more info if needed. thank you!!

[PGreenSVT]

Check your O2 sensors if it has any. Sounds like it is running ok in open loop when running from tables but when warmed up and trying to run closed loop from sensor input it is messing up.

[wright337]

I agree with ^^^. With the crapy gas everyone is running now, we have atleast 2 vehicles a week come in with o2 sensors bad. If you have access to a scanner it should be able to tell you alot. Good luck.

[docweld]

I replaced the o2 sensor the first time it started doing it and it did not help, it was a broken 6 month old spark plug. so yes it is new.

[Turbostang500]

Dang, are you buying champion spark plugs??
Those things are junk.

[docweld]

Originally Posted by Turbostang500

Dang, are you buying champion spark plugs??
Those things are junk.

No, I do not think I ever have!!LOL Bosh platinum. Now I think they are NGK's

[MDarrough]

Originally Posted by docweld

I replaced the o2 sensor

Not real sure about a '93, but my '99 Maxima has about 6 O2 sensors!!
Before the converter, after the converter, and more!!

I beat my head against the wall for months trying to figure it out, and spent a lot of $$$ replacing things. Finally took it to a guy that has a dignostic machine, and it took him 5 minutes to find the faulty sensors. I would have been way ahead and less stress to just take to him in the beginning.

Good luck!!

Mark