Had a similar issue with an 08' Hybrid. Fix was new plugs and FI's... but IIRC, the plugs were the most noticeable difference.
How many miles on your 06'? When were the plugs changed last? Iridium plugs? ...should be replaced before 100k miles expires on the current plugs, IMPO.
How many miles on your 06'? When were the plugs changed last? Iridium plugs? ...should be replaced before 100k miles expires on the current plugs, IMPO.