Engine surges when disturbed with throttle or storing tune

[mlauzon]

Hi,

I have almost 250 miles on my MS setup. It really runs very well as is, but, now I am into the finer points of tuning.

An issue I have that I cannot figure out. Once the engine starts from cold and finds a nice idle after a minute ( I sometimes need to use throttle, to keep it going bring rpm up), then for the next 5 minutes the engine surges to about 2500-3000 rpm and slowly come back down to idle speed (1000) whenever I touch the throttle a bit of store auto tune of burn some new data to the ecu.

Once the engine warms up, it does not behave like this and has a very stable idle. I am running in closed loop idle.

Any help appreciated

[Piledriver]

Log. Msq. Description of config (ECU type, IAC, as well as remainder of normal engine specs.) please.

I cant remember what i ate for lunch, so recalling your engine setup is far beyond unlikely.

WAG is you need to tune your IAC %/temperature/RPM preset table, and maybe need to run the WUE wizard.

WUE and Idle is the hardest thing to nail down, due to the short time the engine is actually warming up from cold, and the limited tries per day.. VEAL handles normal running great.