trys to die at stop light

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01ExpyOwner

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i have a 01 expy 5.4l xlt 2wd 235k-ish, it has code p0420 and p0442, bad cat bank one and hole in evap system, my problem is every once in while when stopped at a light, it will try it die, i would have to give it a little gas (not to much when im behind someone), also i think my gas gauge is off i acts like its out of gas at a quarter and tops off at above F, could either code cause this?
all help appreciated
 

1997SCEBFEX

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any recent maintenance; or do you have maintenance due/past due other than what you've identified?
Quick hits:
* IAC replace/clean
* Fuel Filter
* Air filter
* MAF Dirty
* Vacuum leak/s
* PCV valve/line

those codes surely aren't good and can exacerbate any condition as the PCM tries to compensate.
 

1955moose

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Biggest one is find and fix any vacuum, or exaust leaks first. Anytime you have a lean Condition on newer vehicles, the computer tries to compensate, not good. You will plug up cats eventually, very expensive fix. So jump on the leaks now.

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01ExpyOwner

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im wanting to do a tune up and oil change but that might have to wait due to Christmas gifts, i'll need to save a little more before anything major, hopefully it's a easy fix, would a bad torque converter cause it to try to stall?
 

TobyU

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That evap code if gross leak is prob a lot of it.

Look listed for vacuum leaks. Take a 3 foot long piece of 3/8 fuel line and put on end in you ear and hold the open end around the engine at places to hear leaks.

The evap line of of fuel tank often causes this type of code. Get under it and look for rotted off or spongy areas.
It goes all the way up to the evap charcoal container thing. I think it's in one of the front fenders on an 01 maybe behind headlight.

The pcv hose in valve cover and that line loves to deteriorate on those and there is a rubber elbow on back of intake that does the same and will cause all kinds of lean mixture and idle surging.
Listen for those with the hose and feel around them too.
 

TobyU

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That's a nice one there. I don't have a smoke machine yet. I can rig one if I have too but have been able to hear them so far.
 

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