I have a 2007 Outlander Warrior, not had it long, bought second hand etc. It's absolutely great until it hits 85 - 90 mph on the motorway, then there appears to be a drop in power / vehicle will not accelerate (even at lower speeds say 50 mph). It feels like I'm driving an HGV when it happens!

When the vehicle is stopped for a few minutes everything is back to normal.

I'm not a tech like person, does anybody on here have any ideas as to what the issue may be???