car starts and runs fine apart from the chain rattle at first ,smooth and idles well you can drive it hard no problems turn engine off and restart all ok but if you leave it 10 mins then restart it runs proper lumpy as if it is not firing on all cylinders , you can smell the fumes from the exhaust no power but no eml light on turn off wait till the engine goes cold and start again all fine will run allday fine untill you turn off and restart , have orderd a new coolant temp sensor today but will not have it untill friday just wondering if anyone has had the same problems and what your thoughts are on what could be wrong dunno..