In need of some car help! I've got an s reg corsa, when I get to 65/70 mph my engine management lights comes on and the car doesn't gain anymore power and feels heavy and sluggish. The only way to get the light to go off is to completely stop accelerating, which on the motorway isn't the best thing to do! Also, when my car has been off for a few hours, it feels like something sticks and shudders when I start it. I've had the air filter (or something) looked at and cleared out, but it's still happening. Does anyone have an experience with this, as the car isn't worth me keep paying out to try and fix it. Any advice?