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need help wife's 3.4 Impala
Hey everyone,
thought I would come to you guys for help being everyone been so helpful with all my other questions.
My wife owns a 2005 Impala with the 3.4. Car would stall just once when really cold outside, after it died it would fire right up and run fine with a little stumble at idle. I ended up replacing the fuel pressure regulator as it was covered in fuel and leaking it back into the intake through the vacuum line.
Car was fine for a bit starting when the outside air is cold. Now the problem is back again. it only happens when it's cold outside and it only stalls once. After that it never does it again whether she is driving the car or idling at a stop light. When it's warm outside or the engine is warm it never stalls after shutting the car off. I checked the new fuel regulator and it's fine. The air cleaner is decent but could use a change. Fuel filter, spark plugs, PCV, are all new. The plug wires are original with 142k on them.
Any ideas would be appreciated. I would say it's the IAC but it only does it once when everything is cold and its cold outside. Maybe the MAF? I'm not sure. Throttle body and blade looked clean as I had it all off to change the fuel regulator.
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