Hi mercurygirl79,
Thank you for the donation.
P0171 is vehicle is running lean and the PCM is correcting it to make it run rich.
This should be the cause of the surging and stalling.
Possible causes for this problem are :
1. Fuesl system malfunction. Check if the fuel filter is clogged or the fuel pump is weak.
2. EGR system malfunction. This normally should be accompanied with a trouble code which you did not retrieve.
3. Air intake or system vacumn leakes. Check for vacumn leaks and the PCV valve.
4. Engine oil level too high.
5. Excessive internal engine wear. This would be indicated by excessive blowby gases.
P0303 = Misfiring in cylinder # 3. Replacement of the spark plugs should have rectified this problem.
P0420 = Catalyst system.
It could be a fault with the catalytic converter or due to P0171.
Try resolving P0171 first to see if the problem goes away.
3.
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Sunday, December 27th, 2009 AT 1:20 PM