This just started two days ago. I start the engine and it has a very lumpy idle when cold. Ambient temp is not a contributing factor as it does it in the cool morning or hot afternoon. The car has 12k & no mods other than a crank pulley and pitch stop. After a couple of minutes when the engine is warm it idles fine. Noting one other thing it has always done that has been a concern is when coming to a stop and depressing the clutch pedal the RPM's drop almost to a stalling point then it recovers?
I will be taking it to the dealer for diagnosis and repair, just wondering if anyone else has experienced this issue and what might be the cause?