This started happening recently and I was wondering if it's normal or is there a cause?

Each morning when starting my car to go to work, it stumbles around 400-500 rpm for a few seconds until it jumps up to 2000 rpm and does the warm up routine.

I just want to know if it's bad for the car to stumble at low rpm like that and what could cause that?

 

I'd prolly go for a general tune-up. You know... plugs, air cleaner, timing check, general diagnostics. When was the last time you had this done?

Any chance you got some bad gas? Err... gasoline?

 

Not sure of the cause, mine has done that in the past and then it goes away, I usually run a bit of Redline fuel injector cleaner and it helps. I think it's fuel related myself.

With mine I can get the issue to stop by giving it a bit of throttle at start up, even though you aren't supposed to need to touch the gas pedal when starting.

 

I've had the car for 3 months and haven't done any tune ups or maintenance on it yet. But I'm putting a quart of oil in it every 750 miles so the oil doesn't need to be changed yet imo.

And I'm using 100% gasoline 92 octane without ethanol.

 

I'd go for spark plugs and air cleaner filter. I'd use OEM NGK (7772) PFR7G-11S and factory air cleaner. Then, see what happens.

Seems that the dipping of the RPM's could be an ECU issue. Check this link:

https://www.s2ki.com/s2000/topic/386...-stalling-etc/


Good luck!

8^)