Had this problem intermittently for a number of years and it is getting worse. When the weather is damp, less so now, and I go somewhere that is 5 minutes away the van will not start unless it sits for 15-20 minutes. If I drive for 15-20 minutes I do not get this problem and will not for the rest of the day. Also sometimes tries to die if I hit the gas to quickly during this warm up period. TPS problem? Have changed the cap and rotor. Coil checks out when cold.