His picture is of a newer egr valve. Push up on the vacuum port and clean around the valve with carb cleaner. Take a piece of heater hose and try to blow through the valve. If it leaks get a new one. The throttle body is in two pieces I'm almost sure. Tighten the upper part against the gasket. See if the vacuum diaphram part of the egr valve is leaking if so replace. If its your original pcv clean it out with carb cleaner or replace. Check pcv hose to be sure it isn't plugged.
If your brake booster is leaking get a rebuilt or good used one. Lay a ruler flat over the hole and measure the length. They can be adjusted so write the length down before turning in yours for a core.
What is your mileage on this engine? Do you know how to check timing? If you do can the computer advance the timing?
If over 100,000 and the timing chain hasn't been replaced turn the engine over by hand about 60 degrees past top dead center clockwise. Then turn back counterclock wise to zero degrees. Pull the distributor cap and use white out mark the dist. where the rotor tip is. Have somebody watch as you turn the crank by hand. Stop as soon as the rotor starts to move. Anything over 15 to 20 degrees the timing chain needs replaced.