RPM randomly dips while driving.

[Subiegal]

I tried looking up my specific issue but didn't find anything so I apologize if it's been done to death.

 

My RPM's randomly dip while driving at a slow speed (30 kmph or so) just for a moment. I don't feel any difference nor does it feel like I will stall. Subaru had done a computer update on it when I got the car (it was used) and it corrected the problem.

It idles around 600rpm. Is that normal for a NA auto? Perhaps I'm used to my Honda which idled higher but was manual.

It does not dip at idle. Only when low speeds.

 

I got a P0028 code a few days ago, checked everything that I could check and all seemed fine. Code is out but car doesn't seem like it usually is and has been doing this dipping thing since.

 

I drive an 08 NA leggy, auto (waah).

 

Any help is appreciated so I don't have to take it to the stealership so they can bend me over on pricing.

[SubOperator]

Hi there. Do you change engine's oil regularly and do you check the oil level? Similar problems are related to oil :

 

http://engine-codes.com/p0028_subaru.html#disqus_thread

And yes, Subaru NA engines idle super low, so no worries.

[Subiegal]

Hi there. Do you change engine's oil regularly and do you check the oil level? Similar problems are related to oil :

 

http://engine-codes.com/p0028_subaru.html#disqus_thread

 

Hello! I bought the car about 4000kms ago and it had an oil change right before I bought it. I constantly check my fluid levels as well. She is going in next Monday for an oil change to see if that will help the issue.