If it's not starting using starting fluid if the engine is turning over then it's most likely not getting fire. Could be the crankshaft position sensor went out on it or a bad coil pack. Might also try checking the compression on the cylinders to make sure the compression is good on all of them and that it's not an internal problem. If the starter isn't turning the engine over check all the connections at the battery, ground and starter to make sure they are all clean and tight. | 
