When it sits over night or sits about 20 min I will start it up, idles fine for about 2 min then it starts to bog down like it starving for fuel. It does this for about 1min then it comes back up and idles fine even during the drive. Idle speed valve replaced, plugs, air, and oil replaced still the same. I watch the tact drop down about 1 notch during this time, then it comes back up as normal.,