had Coolant leak behind intake manifold. Was a broken plastic T fitting. Backed car up on ramps. Raised suspension up so it was easier to get under car. Removed Intake manifold, Air injection pump, replaced bad part. reassembled. While putting it back together I dropped a screw into the coolant pipe area and fished it out with a magnet.Got to close to starter and sparked . Finished reassembly Etc. Tried to start vehicle. It turned over and fired up for about a second. did this about 6 times and decided to look at front of engine by Throttle body. PSM failure workshop showed on Instrument cluster. I realized that plug-in was not tight on Throttle body. Pushed it on and vehicle won;t turn over now. Replaced battery, checked all fuses, Tested a few relays, When I turn car on the radiator fan runs after a about 10 seconds. Starter will not turn over. Code P0864 comes up. What have I done, or forgot, or missed.