I have a 2000 Ford Explorer. When i start it in the morning it shakes for 10-20 seconds and will stop after i have it in drive for a while. What would cause this?

Your are problem having a fuel or vacuum problem. It could possibly be a clogged fuel filter slowing fuel to the motor but it is very common for fords to have vacuum leaks. Check all vacuum hoses or leaks. It is also very common for the intake gaskets to leak(although more common on for trucks). Any trouble codes? Possibly system lean on bank one or two?