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ok, heres what you do. (or what i would do anyways)
go buy a new set of spark plugs and install them in the car.
take your car for a quick test drive and run it fairly hard for about 15 minutes. stop the car, and take out each plug one by one and examine it. If you have a bad fuel injector, one or more cylinders will run really lean, and this can be determined by the plug being a nasty white color with blisters. If all of your plugs look good, check for a short in the wiring.
If this doesnt solve the problem, check the plugs again after a day or so. If it is a fuel injectio problem, it will make the car run lean.
You can also get a service manual and use it to look up the specs for a fuel injector......meaning put a digital test meter on it and measure the resistance. If any dont fall within spec, replace that injector.
the spark plug trick works if you have mpfi injection.
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