Engine light is on yellow perminantly and when i put the key on and turn the electrics on but not fireing up the engine the EML light stays on too? Once the the engine has stared up the EML goes off the engine light stays on but the car seems to have lost power it runs but does not seem as responsive?

These lights are computer readings. When a sensor reading goes bad, it tells the computer, then lights up the dash light. What you need to do is go to your local Advance Auto, or Auto Zone and ask for a computer diaglosic test. They will do it for free. If you have a car that they can not plug in to like a Ferrari, then you should go to your car brand's dealership. A diagnostic test will tell you exactly what sensor is reading trouble and send you down the right path to repair instead of running around.