Sounds like a crank sensor. The crank sensor is usually mounted at the seam between the engine and
the transmission. It has three wires: one will have 8V on it compared
to ground when the ignition is ON, and if you measure the voltage
between the other two wires you should see ii switch back and forth
between 5V and 0.3V as you turn the engine by hand using a socket on
the crankshaft bolt, again this is with the ignition ON. If you don't
get that then the sensor is bad. You can read these voltages by using
a very fine pin pushed thru the insulation of the wires to make contact
with the conductor inside.
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A loose gas cap will sometimes trigger the service light to come on. Since this appears to have happened on multiple occasions I can assume that this is not the problem but may be associated with it. The level of gas in the tank affects the amount of atmospheric pressure in the tank. There are multiple things that could set off the light, one being a loose or defective gas cap, and the other is a fuel vapor return valve. I'm not sure of the exact type of fuel system you have so I cant give a more exact answer. If you wanted to give something a shot before bringing it into the shop, you can simply replace the gas cap first, a very cheap try.
try the fuel filter and make sure you have proper oil pressure!! Remeber if you have tried craking to many bad times then the plugs are going to be fouled out!! Means that they are going to be drowned with gas and need replacing!! Also make sure your fuel pump is coming on!! You should hear a hissin or a hummin noise back from the fuel tank!