Back to your original post:
Originally Posted by LakevilleSSEi
So now the 02 sensor has been replaced, and now I'm getting a rough idle in park and in drive, to the point in drive that the car feels like it'* cam'd? Any thought'* or suggestions? Also today I took it out on it first 100+ mile trip and when coasting in D the RPM'* fluctuate between about 900 to almost 2000 and when it hits about 2000 it will actually accelerate the car......Wierd.....Any thought'* on this one too? I was forced to run 90 octane today when I had to fuel up, but I did run some octane boost when I filled up. Also what is the average mileage that this car should get? What does everyone else get for mileage?
I don't see anything here that would be related to QDM1 (or QDM A). But that'* still a problem as I stated in the other thread. You should track this down.
What I would do at this point:
1. Delicately clean the filaments on your MAF sensor with rubbing alcohol and a Qtip. VERY delicately. If that doesn't help, try running with the MAF sensor disconnected.
2. If that doesn't work, buy a TB gasket, and remove your TB for a thorough cleaning (with the MAF and IAC removed). Clean the IAC and it'* seat in the TB very well.
On the octane issue, most over the counter boost products raise your octane one point. Thats POINT one. You were running 90.1 octane after you put it in.
I don't know what most get, but I get 29-30 mpg on the freeway at 70, and a recent trip to Seattle at 80+ netted me 25mpg.