Wont start without some help.

Ok, so I bought it for $400 and now into it for about $900, When its cold it wont start just turns over. Will fire with starting fluid or jumped from another car and run great but shut it down and wait 20min it wont fire again without some help. Replaced spider injector, plugs wires, ignition coil, battery, fuel filter, drained tank and filled with new gas. Im getting the right voltage to the coil. Im just baffled and dont know what else to do.