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It could be a vacuum leak on the inlet manifold or pipes
Start engine and allow it to idle, spray some wd 40 or similar around the inlet manifold & vacuum pipes, if you notice a change in engine speed when you spray you will have found the area of the leak
I know i have the same problem, and i also noticed than when i open the Hood the whistle just stops, so i figure out it must be some air cycling in or out osmewhere, I found out my air intake connected to throttle body was misplaced a weird gap was left open allowing air to whistle. u might wanna check there
the iac probably has carbon built up around it this controls the idle speed try cleaning it first,if not it could be a bad iac or a vaccum leak that the iac takes some time to compensate for to control idle.
anything over 4K is pretty much above the useful torque curve of the engine. Therefore more rpm's will not do you as much good as you might think. If you intend to do any hill-climbing, you will need to begin by changing both front and rear gearsets (if you have say, 3:23's, go to 4:11's etc) You will also need to do some engine mods such as a different camshaft, headers etc. (this will alter torque curve) Factory gears are generally installed to accommodate a certain region where the vehicle was originally sold. If the region is flat, then the gears will not work well in high terrain. If you are not hill climbing and just have occasional problems with hills, There isn't really much you can do about it especially if you have a four cylinder in there. One thing though is that if you have oversized tires, get rid of them...they change your final drive ratio and definitely will influence your performance.
Sounds as if converter on exhaust is getting plugged up. have it checked and replaced. That will force exhaust out ahead of it where ordinarily it would flow with less pressure. Oil leak is a separate item.