Sometimes the orange low-fuel light will come on and sometimes it doesn't. Mileage on half a tank of gas varies from 35-45 miles. Spark plugs & wires & intake manifold gasket were recently replaced. No lights other than the low-fuel light come on. The temperature gauge was going toward hot (about 2 increments past the half-way mark). Pulled car over immediately. Once cool opened the hood and notice coolant under the reservoir tank. Added more coolant & it hasn't ran hot since. Based on the issues mentioned, does it sound like I have something that needs to be diagnosed at a shop.