Hey everyone, Ive been having a strange issue with my G (6mt coupe), I noticed after I bought the car that the idle was low it sat around 600-650 but would occasionally dip down to around 500 when at lights in when i have the clutch pushed in its fine but still kind of low when I let the clutch out the engine bogs very low and you can feel the steering wheel shake and the engine feel as if its going to stall it always catches itself though.

Then I noticed if I keep the A/C on it would idle around 750 sometimes it was a little high and would hit 800 but the car idled smoothly it was not shaky like without a/c on.

Today I was driving and inching my car into my friends driveway I bogged the engine pretty low and it shook but I caught it before the stall when i had parked and let the clutch out the idle went back down to 600, I turned the car off than on and the idle went back up to 750 after driving for a while it would go between idling at 600 and idling at 750 but always at a different stop (It wouldnt go from 600 to 750 while sitting one light it would be at 600, the next time i stopped it would be 750 but more often 600)

My windows were fogging up so i turned on the rear defroster and that bogged the engine down to 550 and you could feel the car struggling to stay running.

Anyone have any ideas? The car had a check engine light for an evap leak that coincidentally went away right before my idle dropped down to 600 again. I had assumed that because the temps are now low (in ontario) that there were less gas vapors so it stopped leaking enough to be detectable but now im wondering if they are related. Any help is greatly appreciated.

 

Yes EVAP leaks cam cause poor drivability, fix the EVAP problem, also check for vacuum leaks, also do an idle air recalibration.

Does Tom fluctuate when you turn the steering wheel while parked? What about when you press the brakes while parked.