Rebuilt ECU, now low idle

[Beanbo92]

I'm assuming the dashpot isnt working due to not high idle for 15 secs. But il try and get someone over so I can do the 2 person test. When the m/t ecu was in it would crank up idle to say 1500 or so stay there for 15-20 secs then go slowly go down to normal idle.