I have been chasing a power loss demon for a couple months. recently had my plugs changed out hoping it was that.The power loss seems to have gone away, but now I will randomly stall at idle.
When the power loss happens the tach drops 500-1000 rpm and it "feels" like the trans is slipping.
When it stalls its idling at 650(ish) and it will sputter for a second then drop to 0. No codes, and starts up afterwards. Whats really tripping me up is sometimes, after restarting, it wont go into gear. I just shut it down and then restart and the problems is gone.
I looked last night and the air filter was gunked up pretty bad, so I was thinking maybe its a breathing issue. Cleaned that and started her up. It didnt stall, but it would still have the power loss of 500rpm or so.
I also thought maybe bad gas. I ran a water treatment and a can of seafoam through the last tank and a half. It seemed to help, but i really dont know.
Research is pointing me towards the vacuum lines, an o2 sensor, or cam phaser problems.
Any one have any thoughts?