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Ask Dan Your Own Question
Dan, Technician
Category: Chevy
Satisfied Customers: 23966
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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I have the code po171 and p0300

Customer Question

i have the code po171 and p0300
Submitted: 6 months ago.
Category: Chevy
Expert:  Dan replied 6 months ago.

Hello, my name is ***** ***** I'm here to help get your problem solved.

Expert:  Dan replied 6 months ago.

Has anything been replaced? Does it lack power under hard acceleration or idle rough?

Customer: replied 6 months ago.
idles rough replaced o2 sensor bank 1 sensor 1 an 2 cleaned mass airflow senor
Expert:  Dan replied 6 months ago.

Rough idle indicates vacuum leak or possibly clogged injector. You can use carb cleaner to spray around intake gaskets, throttle body gasket, vacuum lines ect to see if idle changes. If idle changes check for vacuum leaks in area you are spraying. If you are pretty certain there are no leaks I'd have injectors tested. Let me know if you have questions, thanks.