2003 Yukon Issues 5.3L

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charlie1983

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Feb 23, 2016
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I really need help with this.. I recently did a tuneup on my car.. which consists of:

oil change (10-30 pennzoil)
oil was a bit sludgy from oil not changed from previous owner..

K&N air filter
cleaned TB
new fuel filter
new spark plug iridiums
new spark plug wires


and i did all this change because when motor is cold and i turn on thr truck, the motor starts sputtering as if the truck is going to turn off.. no check engine light.. and when i did i got P0171 and P0174.. tis the reason I installed the new fuel filter on saturday and since then, no more check engine light at all.

took TB off to clean in which that was really dirty and used carb cleaner to clean as well.. seemed fine..

when i turn the truck on and sputters and shakes the motor, i spray carb cleaner to see if there is a leak and experience no change in the way the motor is acting.. but once warmed up, it is perfectly fine..

does anyone know what this could be? any issues you have experienced? please let me know..
 

SidewaystheSeven

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Jan 7, 2016
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Subscribing. After taking off my intake the other day to look at the TB I started getting the same codes

Sent from my LG-H811 using Tapatalk
 

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