DustinEgle Posted July 21, 2018 Share Posted July 21, 2018 Was driving at 75mph down the freeway on cruise control and my car suddenly felt off, my MPG dropped from 27-28 to 10-14, it wouldn't accelerate well at all (it stuttered it's way), and with cruise control on it felt like it was struggling to keep up with the speed. I pulled off and the idle is R.O.U.G.H....The whole car is shaking and it sounds horrible. No codes are being thrown, AP doesn't show anything, and I tried resetting the ECU but it didn't fix it. Any ideas? It feels like I'm being shaken like a baby sitting at idle lol. This happened once about 3 weeks ago, but it suddenly went away and the car was perfect again as I was sitting in it trying to figure it out. Came and went. Now I'm hoping it goes away again so I can comfortably go home but something definately isn't right. 2008 legacy GT, 25k on new engine, forged internals, topmount, vf52 turbo, spt intake. Been sitting at idle for about 5 minutes now since my ECU reset and my AF correction is -8.6/8.6. Link to comment Share on other sites More sharing options...
DaveWaters Posted July 21, 2018 Share Posted July 21, 2018 On your AP did you monitor cylinder roughness or avcs left and right? Link to comment Share on other sites More sharing options...
JmP6889928 Posted July 21, 2018 Share Posted July 21, 2018 Front O2 Link to comment Share on other sites More sharing options...
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