2008 mustang gt.. Running rough, rough idle, loss of power
I have a 2008 Mustang GT and it has been running rough all of tthe sudden. The exhaust has a strong smell and it you can hear from the exhaust it sounds like it is missing or something. Does the same thing when I am driving and I left off the gas and the rpms are coming down. Also when I am sitting still and have it out of gear and I give it a quick rev, say to about 2k, the rpms come back down and drop to about 450 or so and it almost sounds like it wants to stall, then they go back to normal. Does this all day, even when for example I am pulling into a parking spot and push in the clutch after letting off the gas and the rpms will drop like I said and then shoot up for a second. The rpms dont move much at idle but the engine kinda vibrates a little. You can tell it is not running right. If I rev it slowly to about 2k or 2.5k the engines starts to vibrate but then stops when i rev higher. I only have 26k miles and have tried a lot already to remedy this. The only thing I have put on the car besides the Cervini body kit is an o/r h-pipe to go with cervini side exhaust and JLT cai with SCT 91 Tune. I am thinkin maybe it is the 02 sensors because i had to replace one when doing the exhaust because it stripped out. It is a different brand the rest. But I am not reading any codes from the PCM. I have cleaned the TB and MAF sensor. It helped a little but not much. What do you guys think?