reduced engine power and service stability trac light is on

tray

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2009 gmc sierra truck, reduced engine power and service stability trac light comes on in 4x4 is hard to shift and pulls forward while holding the brake
 
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tray

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It hard to put in 4x4 because it starts pulling even though I step on the brake pedal and then stalls out.
 

98trck

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wow i am old school ( stick shift ) is it still hard to shift into 4x4 if the trans is in neutral ?
how many miles on the truck?
lift kit six inchs or more ?
has the transmission N transfer case been serviced?
 
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