strange missfire...

[jarrelcr]

I have a 97 with the 3.8l, that had a problem, according to the computer, with an 02 sensor. I replaced the sensor and after driving the car about half a mile, it developed a very bad miss (maybe running on 3cyl). The strange thing about the miss is, when cold, the car runs fine. It also runs well when I put it to the floor. I have replaced plugs, wires, fuel pump, and had the injection system cleaned, but the problem hasn't changed. Any suggestions would be greatly appreciated. Thanks in advance.

 

[jarrelcr]

just an update - I replaced ignition coil and cleaned the MAF and it seemed to get a little better. Then one day the problem just went away and service engine light turned off.