My 94jeep grand cherokee started running rough a couple of weeks ago, and they read the code and said it was a sensor regarding the acceleration. so, we replaced it, still running rough and getting worse. when we read the code using the key turn trick, it comes up 12 13 55. can anyone help me find out what this means?
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Sounds like a few issues. The check engine light should come on when you turn the key to "ON" without attempting to start it. If it doesn't, the bulb could be bad and that would mean removing the instrument cluster to change the bulb.
The rough idle issue could be a partially stuck open EGR valve. Remove the valve and clean it good. While you have it out make sure the diaphragm moves freely. Replace the valve if you can't clean it or if it doesn't move.
Go to your local auto parts store and ask them to read the codes (most store provide this as a free service).
If you haven't changed the plugs or had the fuel system cleaned, now would be a good time to do it. The number 1 culprit for rough idles is dirty injectors or plugs. You can try an injector cleaner in a can (or bottle) for under $10 and see if it helps, and then work from there. If there isn't any improvement then if you are able to, check the plugs for any gunky buildup and if you find a bad plug, make sure you replace them all (or have them replaced) at the same time.
My 2000 Grand Cherokee had the same problem, without all the sputtering, it would just die approaching a stop. We could only keep it running by slightly pushing down on the gas petal when coming to a stop. I replaced the Throttle Position Sensor, but that didn't change anything. A new mechanic I found replaced the Idle Air Control Valve, and we've had no problems in a week.