engine code

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the code is P0457 and it is a tj 2006 6 cyl. thanks Rob , also the jeep seems to want to stall when stopped at a light, I push the clutch down and it goes away , but not all the time

[1993 XJ]

if its cold, the transmission fluid is thick enough to add some drag to the motor even when in neutral. I can stall my 4cyl when its 10 degrees F or less just by letting the clutch out in neutral. but as for the code, the others are right about it causing hiccups in the idle due to the computer trying to figure everything out while having a bad sensor.

[1993 XJ]

I just looked it up and that code is an EVAP emissions code. Its generally a gas cap that no longer seals correctly or a leak somewhere between the charcoal canister and fuel tank itself. Do you smell fuel at all? Do you hear the tank sucking in air when you remove the gas cap?