Idle issue could be something as simple as the fans cutting in and out, it happens on mine but then again that's been played with.

DON'T WASTE YOUR MONEY ON THE EXTRA WARRANTY"

__________________
Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.