5kph

Hi, I followed this process to run the car on Speed density, the car starts and runs, and revs no problem, but when you try to drive off the car stalls out when you get to approx 5kph, the car immediately restarts no problem, I think there is a tab that is not right.

Sounds like something related to existing idle control. Some ECUs have a "throttle cracker" that indicates how much the bypass air valve needs to be left open when exiting idle control. Perhaps that is the setting or area you need to look at.