Hey all, I've got a 2009 Pontiac Wave, ~213k kms, manual transmission.
Here's the issue: While driving it will suddenly lose pretty much all acceleration power and start to slow down (it has enough to get it moving from a stop without stalling but just barely). When this happens it will idle EXTREMELY rough at about 1200rpm in neutral.
Now the strange part: To fix it I will pull over, turn the engine off, and wait two or three minutes. Once I turn the car back on it seems to run and drive perfectly fine (until the issue happens again).
The issue started out happening every ~50km of driving, but has now gotten to the point where I will no longer take it on the highway and just drive on small streets around town.
The codes currently on the car are the dreaded P2135 as well as P0599 (not worried about thermostat just didn't feel like replacing). The throttle body was just replaced back in August of 2018 (~8mo ago).
Any advice or troubleshooting tips would be appreciated. I'm getting a new car but would like to try and keep this guy operational for long enough to spend some time searching.