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#1
07-05-2006, 06:07 PM
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99 codes. shifting and rev problems
i got a check engine light.and here is what i got:
P0401 EGR Flow insufficient p0171 system too lean (bank 1) p0174 system to lean (bank 2) when i drive it will start to shake when its in overdrive and its kinda jumpy around anywhere from30-50 mph. didnt test it with overdrive off.it seems to stutter a lil before it revs. and seems fine after 2,000rpms... 
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#2
07-05-2006, 08:23 PM
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Re: 99 codes. shifting and rev problems
it also does it with overdrive off... feels like when you have a trailer on the back of a truck and it kinda pulls and shakes. i was told it might be a shutter or something in the transmission? please help, and thanks in advance...
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#3
07-24-2006, 01:37 PM
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Re: 99 codes. shifting and rev problems
I just had the same problem with my 2001 Cougar. It turned out to be a senser that controls the EGR valve. Don't remember the exact name but I hope this will help.
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