With the air cleaner air horn off and cranking it over did you smell any propane? If not I would try spraying the starting fluid directly into the throat of the throttle body to see if it will start. If it does start then the injector housing is probably plugged with tar. It sounds like your throttle body is working properly. The small whining noise is when the throttle plate opens slightly when the key is turned on. From earlier messages you said you have spark to the plugs and a blast of fuel to the injector housing thats the way it's suppose to work. Did you locate that fuel screen yet????? Have you pulled the plugs and checked their condition? If you haven't be careful because they can bind up and strip the threads out in the head!! Be careful doing this!! The new plugs are not threaded all the way to the bottom of the plug to stop that issue.