How reliable are engine coolent temp sensors(the blue one at back of engine). I replaced mine over a year ago cause my cossie 4x4 was missfiring when warm. Ive just noticed a few times when i first start and drive my car that sometimes the car seems to speed up without putting to much pressure on the throttle pedal. It feels like the sensor is telling the engine that its to cold and putting more fuel in. Someone said it could be a faulty ect sensor. Has anyone had the same fault before.