Finding a Vacuum Leak

courtesy of Bob, The Auto Answer Man

Hey Bob,
I changed two oxygen sensors, all the spark plugs, and the connecting wires, but my problem still persists. I only changed the two because all the codes disappeared when they were changed. Currently, I do not have the MIL "on," but the problem is still there. My mechanic said that there's a vacuum leak and is charging $75 just for the smoke test to find the leak. He added that the vacuum leak is the reason why my A/C is not cooling at all. However, the heater works perfectly. The car feels sluggish in the lower two gears when driven over a long distance (or when it's hot outside). Also, it idles roughly and vibrates in fourth and fifth at speeds over 75 miles per hour. Your help is truly appreciated.

You can check for a vacuum leak yourself. Take a can of spray carb or fuel injector cleaner. With the engine running and warm, spray around all vacuum lines and connections. If you hear a change in engine speed, you just found your leak!
Good Luck!
Drive Safely!
Bob, The Auto Answer Man

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