Regarding the 2005, I did for many months as I went through various other things that I knew the car needed, all the while hoping it would fix that problem too. In the end, readers (and dollars) were scarce circa 2006ish and I didn't want to drop $150.00 on a guess. It was a matter of planning starts a little more and otherwise fine for the 95% highway driving it saw.

Then one day the angels sang as a golden ray of light began warming my shoulders. I was walking through a junkyard and actually found a MAF sensor on a poor sad Bonneville that was recently at the wrong auction at the wrong time. For a very long time I was looking for one (to satisfy my guess about MAF being the problem) and they were all gone all the time everywhere . . . so this was like gold to me. I didn't have a torx handy, but I did have my leatherman and the protective instincts of a momma bear protecting her baby MAF sensor. Five very patient minutes later it was out and ~$10.00 later it was mine. Five minutes later it was installed and low and behold my car was back to normal. 80,000 miles later it'* still in there.

(now I'm drifting a bit) This car has never set a code except [transmission component slipping] long ago before I installed the giant transmission oil cooler to circumvent the 4T60E surging issue that I covered in https://www.gmforum.com/buick-172/19...6/#post1618400 . Now I have to admit that on a recent 500-mile drive to a few states away it told me [transmission component slipping] again, but only on long steady flat drives with no shifting. Still no surging. That'* a story for another thread.

(now un-drifting) Anyways, that'* how I could imagine someone driving a car that way for an extended period of time.

Regarding the 2006, my gut says transmission service and maybe TPS, but it still doesn't make sense. I agree, telemetry and diagnostic codes need to be acquired.

A thought that popped into mind while replying to Tech II, has your 2006 transaxle ever been serviced? Not flushed because flushing is generally evil in my opinion. Just drop pan, swap filter, clean, fill back up -serviced. I'm guessing that you've only had it two weeks so you haven't done it. Perhaps do a service on it and see if symptoms change.

the way someone drives this for so long is because when you are broke you find a way.... and the way is on the 05 when it has lose of power pull over turn off ignition and restart! Problem usalky gone.

Would the electric injection air pump cause the car to stutter and sputter?

Code p2431 now i heard an exhaust leak and try to figure it out and found a hose on the back of the motor which my mechanic calls and air injection hose to have a break in it would that cause the car to stutter

Also this is a California emissions car and I'm having trouble finding that air injection hose replacement part if anybody can help that would be great 2006 Buick LaCrosse 3.8 L

No it wouldn't. AIR injection is post-combustion.

Nope, shouldn't.

If I'm guessing right, it'* the pipe shown here?: https://www.rockauto.com/en/moreinfo...432026&jsn=432

If so, it appears it comes with some new pumps. I haven't found one by itself.

This is what i thought it might be ..... but nope
This is what i am looking for but with three nipples not two. I cant find this anywhere!