You can go to Autozone or Oreillys for a free scan. Usually the onboard computer will pickup an electrical problem. There may be something recorded that a scan will show.
If not, look for nonelectrical problems like Vacuum leaks. Take a water spray bottle and go around the Intake and Vacuum lines, a change in RPM would indicate a leak. You could have a dirty Injector which is firing Electrically, but clogged. Since each cylinder bank averages all 3 cylinders for RICH and LEAN errors, an Intermittent miss would not show as easily.
If you have the oldstyle Vacuum gauge, it would show fluctuations for problems in Valve action. Like a Valve not closing due to Carbon buildup, a weak Valve spring, a clogged Lifter, all things not electrical. So if the result indicates possible clogs, you can get Professional cleaning of the Injectors or try a gas additive. You may need a product such as an oil additive, like Lubegard to free the Lifters.
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can you hear any sparks jumping? Check the routings of the wires to make sure thry aren't too close to the engine.
And in the right place
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