Car is stumbling need help
Thread Starter
Teching In
Joined: Nov 2005
Posts: 6
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Car is stumbling need help My car is stumbling BAD!!!! The PCM is pulling timing out because of a trouble code po171 and po174. I have a few ideas of what it might be; fuel pressure regulator, fuel pump, injectors, or MAF dirty. I put on a new fuel filter about 2 weeks ago and all mods are in my sig. HELP!!! 
Staging Lane
Joined: Nov 2005
Posts: 82
Likes: 0
From: Napa, CA
A vacuum leak causes DTCs P0171 and P0174 to set at the same time. Inspect all areas of the engine for a vacuum leak. Also inspect the PCV valve for being the correct one for this application. Make sure the engine oil fill cap is in place and that it is tight. Inspect that the engine oil dip stick is fully seated.
hope this helps
hope this helps
