2008 GMC Acadia hard shaking in low speed

2008 GMC ACADIA
80 MILES • 3.6L • V8 • 2WD • AUTOMATIC
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AADAOUD
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hi there,
I change my spark plug recently and from that moment problem start , first I got traction stop massage and engine light come on , the second problem when I'm driving every think is normal but when I reach low speed very close to stop my car choke very hard like jumbling over ramp and this not happen all the time , I talked the car to so many garage but they could not help, can you help me???????????
Oct 20, 2015 at 10:10 PM
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HMAC300
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can for codes first auto parts does it. then clean throttle plate on boht sides and iac hole with choke cleaner.
Oct 21, 2015 at 6:36 AM
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AADAOUD
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Hi exp.
Thanks for your quick reply ,
the code I got P0171
I done all what you said , but still the problem is the same
regard ,
akram
Oct 21, 2015 at 10:34 PM
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HMAC300
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with that code it means it's running lean, or an O2 sensor problem but check your fuel pressure it may be low. a pro may have to do it if it won't do it with key on only should be 56-62 psi. auto parts rent gauge.
Oct 22, 2015 at 6:00 AM