My car just wont start like no signal to th starter

Won't start how ? When turning the key to start does the starter spin the engine ? Crank - no - start or nothing happens , no - crank - no - start .

Make sure the engine still will turn over by hand, then check the starter and make sure there is a good clean 12V connection from the battery and that the signal from the ignition switch is going to the starter.

bad starter, frozen probably low battery from bad alternator/battery
if both ok then bad starter

Be sure it is in fact the right gas cap. Often when you purchase from someone like bumper to bumper etc the parts people get the wrong info. I suggest you go direct to the dealership pickup a cap and see if that solves the problem.

You may have damaged something with the spray, just start looking and testing the system to see were the starter signal stops.

try adding an extra ground cable to the mounting bolts of the ignition coil.

Very possible you may have a faulty voltage regulator. I would have it tested which many places do for free.

check for signal at starter when key is turned signal is the small terminal.no sound doesnt eliminate the starter as the problem if you have no signal chek the clutch safty switch if it fails truck wont start

your starter is bad

Have you removed and cleaned battery cables/terminals? I've had, out of the blue, suddenly cables just too "dirty" to make connection...