Dont know if anyone still uses this - but

I have a 2007 CTS automatic. In first gear the engine revvs on and off again, even at 1/4 throttle. It does this ONLY in first gear! If I take off in 2nd gear, it runs smoothly. If I am in second gear and then floor it and it down shifts as it shoud, but then goes back to surging on and off until it shifts gears.

Very unsafe if pulling out into traffic as I live just off of a 6 lane divided highway. It is a little worse if the engine is cold, but does it always.

My info center does not work at all, but this did not happen untill a few months ago, even though the info center has been broken for several years!

Any help will be greatly appreciated.--------- Dave