Engine wont start

Car initially runs for 20 seconds and then engine stops runningand not starting back up. Changed coils. Changed fuel pump and still same problem. If I remove fuel pump relay car will start for another 5 to ten seconds and then cut off as if it's flooding out. Getting good spark and compression in all cylinders. Will not run when spraying starter fluid

With full battery, all connections clean and tight the starter will not give any response when key is turned to start position. However car will start when solenoid and power wires on the starter are jumped. With a test light there is no power at the solenoid wire when key is turned to start. I have switched relays to no avail. Also the horn is stuck on when I put the fuse back in. Question: is it possible that the relay/fuse box beside the battery has issues?

Thanks, I will check the neutral safety switch next.

Dear Sir, thanks for the help with pathfider.
I diagnosed these faults on kia. Sorento iP1631 - theft different start enable signal incorrigible. P0727 - engine speed input circuit no signal, P1121 - throttle position sensor intermittent high/malfunction, P1631 - alternatT' open or no power output
I have change the PCUbut won't stat. Please what should I do next.

Regards
fiifi

My engine went out in my kia serento. I had it rebuilt but now it won't start. What could it be