Bigal2012

Only had it for a week now, it keeps cutting out on me when I'm driving normally, it runs fine when I floor it. It when the engine is at about 3k and in gear at about 1/4 throttle, just dies. Leave it about a minute and it usually starts and runs fine, it's recently had a new idle control valve but I don't know what make It is, car idles at about 600rpm and to me that seems a bit low, not sure if anyone has any idea on what it could be but any suggestions would be appreciated! Thanks