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Have the PCM scanned, you are about due for a timing belt replacement. If it shows camshaft or crankshaft corralation error them you need to replace it very soon.
If you have an Advance Auto Parts store where ever you are, they will read the code and tell you exactly what to code is and what it means. Any mechanic who "guesses" isn't a mechanic at all - he's a thief. Emissions leak can be any number of things, but not the gas cap!
By "Replace the gas cap", do you mean put it back on, or buy another one? If you fuel these trucks with the engine running, or don't tighten the gas cap, the light will come on. It will also come on when the seal in your gas cap goes bad. I have had to replace the gas cap on my jeep and dodge already. It fixed the problem both times.
The check light indicates an event has occurred that requires your attention. It could be anything from a bad sensor to a plug misfiring.
You need to get an error code readout. You can get a readout from many auto supply parts stores. The loaner meter is free. You can call around. Try Advance Auto, AutoZone e.g.
On the gas cap itself theres a rubber o-ring.If thats quashed in any way you'll need to replace it.Sometimes takink the o-ring off and putting it back on fixes the problem.Its a very common problem ans is not that expensive to fix..The reason the code keeps coming back is because its a pressurize system and if theres a leak in the system it will throw the light in the dash..
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