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Hmm this post doesnt really tell us who you are, considering this is the tell us who you are forum. Might try posting this ? in the early tacoma forum and get better results. Just a hunch.

Matt
 

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good thing all the noobs are helping out the fellow noob... post this in newbie tech or early taco....
 

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clean your mass air flow sensor w/some electrical parts cleaner. That or your 1st o2 sensor is possibly due for a change.
 

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Discussion Starter #6
I have a 99 3.4 liter 130,000 miles cel p0171 keeps coming up . Has a high
idle on start up after warm idles is good no stalling or surging. 02 sensor are
good . no vaccum leaks found , has a strange noise from exhaust coming
from pas side firewall/floor area sounds like exhaust is hallowed out.
have seen other comment about maf , would failed maf causing bad a/f mixture cause irregular sound in exhaust or double wall construction of
exhaust manifold/headers coming apart cause noise . looking for other solution before dropping exhaust system??
 

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Please don't start additional threads on the same topic. That just clutters the forum. I have merged your two threads together.
 

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Pull your mass air sensor and look at the wires and see if they look fuzzy with some debris on the wire. Clean the sensor with some electrical contact cleaner and re-install it and see if the code stays away.
 
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