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Discussion Starter #1
i keep getting codes p0171 and p0174. was told it was a PCV leak somewhere. i cant seem to find anything broken or leaking..

also, my car stumbles under acceleration, seems like it wants to backfire, i replaced the TPS and cleaned up the TB and MAF. did a tune up as well.

any ideas on what may fix my problems?
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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The codes indicate both banks are too lean. You mentioned you already cleaned the MAF; good start. Did you clean it per the tech articles or just spray it with cleaner?

The next step I'd say would be to check for vacuum leaks and replace the fuel filter.
 

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Discussion Starter #3
cleaned it the right way. i dont screw around with any of my cars.

i couldnt find any leaks that i saw atleast. FF is gettin changed tonight.
 

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Ever find out what the problem was? The best test to see if it's the PCV valve is to replace it. But at the least it should rattle.
 
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