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ECT = engine coolant temp sensor, located just below the thermostat. Follow the top radiator hose to the engine. Newer cars have the ECT and thermostat as one unit, I believe yours is still the old style and separate.
Vacuum leaks can be spotted visually. Just check any elbows for cracks, and make sure nothing is loose. There are miles of hoses, so take your time. Also check the air hose connection between the air filter and throttle body.
You have an electronic throttle which could also be going bad. The fix for that is around $500 at www.xemodex.com
Klaus
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Always willing to listen, just not able to take direction.
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