Run a scanner if you can. It sounds like your purge valve but if light kicks on and of might be a bad catalytic if this veh blew a head gasket in the past you got water threw the cat it damaged it thats why when you idle long it builds fumes and trigger the oxygen sencor.
Get a diagnostic check before you start guessing and spending money. One of those devices can be purchased for about the cost of taking your car to the mechanic. If you are near an AutoZone they will sometimes check it for free.
SOURCE: 2003 Subaru Outback check engine light stays on
You may have to take it to a shop and have them connect their OBD tool to the computer and clear the deep memory. If you have a code left in the deep memory it can reapear like that. Good luck. Please rate me so I know how I'm doing. Thanks.
SOURCE: "check engine light flashing"
The flashing check engine light is typical of a misfire issue. There are two things I would do to start with.
1. Take the vehicle to an auto parts store like Autozone and have them hook up their scan tool so that they can retrieve stored trouble codes. Even if the check engine light is not on, they should be able to retrieve recently stored codes.
2. Do a complete tune up. New plugs, new plug wires, new air filter, new fuel filter if it has not been done recently.
If the parts store pulls the codes and they cannot tell you what they mean, post them up here and I will see what I can dig up for you.
SOURCE: 2003 Silverado rough idle, idles good after "check engine" light
Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.
SOURCE: Car stalls when idling at stop light
have the car checked when the check engine light is on,also a good scanner will be able to give you the history codes,get back to me with the codes and we'll go from there. you need someone with a professional scan tool
SOURCE: Wife's durango is idling rough and running rough
With both codes pointing at TP sensor, I'd certainly take the time to replace it, as well as make sure connections to it are clean, and good. Chances are, you won't be able to take part back anyway. As far as exhaust goes, if it's leaking in the right places in may cause improper readings at sensors downstream, but if not obvious leak, I wouldn't be concentrating in that area right now.
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