Hello, The other day I noticed my "CHECK ENGINE" light came on as soon as I noticed it wouldn't shift into overdrive. The other gears shift fine, just no OD. I also noticed @ cold starts it acts normal for just a second & then dies unless I tap the gas until it warms up. It also dies @ idle sometimes when warmed up after driving it. Modulator valve ? Can anyone please help & is anyone familiar with this problem ? Thanks !!