I have a 96 carivan with the 3.0 in it, 80K miles. After it has been run for a while, then it shut off for a while and restarted - it will run very rough and has no power for the first 30 seconds or so then smooths out and runs fine.
Now I don't know a ton about this stuff, but - I have played with a diagnosis tool on it and what seems funny to me is when I start it the voltage on the front o2 sensor reads about 1.24 volts. I thought it was not supposed to be over 1 volt. After it smooths out it reads a sine wave like I was told to expect, but never over 1 volt.
It also does not do this cold - I guess because the o2 sensor heater is on and the computer does not read the o2 sensor til it is hot (guessing here)???
Best I can tell it is the O2 sensor and I should replace it, but I dont want to if that is not the problem.
Thoughs??? Is there anything else I should look at first??