When I start my xj it idles great, as it warms up the rpms rise until the engine is at operating temp. Once at 210 degrees it adles fine again. I have tested the tps, iac, map, cps. I have also taken the tb off and cleaned it. I also replaced the iac. I have seached here and jeepsunlimited and have not found a solution.
Can a bad Oxygen sensor cause this. I was thinking that the heating element was dead.
I read a couple of threads about O2 sensors and I tried to test it today but my results were completly off. I read that the voltage should jump around between .2v and .7v. Mine jumps around but between 1v and 5v.
So before I waste anymore time can an O2 sensor cause this problem?