Chrisler Neon Failure

Hello friends, I have a problem with a Chisler Neon 2.0 Automatic gearbox of the year 96 The car when you want to squeeze thoroughly when it reaches 4000 laps it seems as if it runs out of short of short time and then returns again at 3000 laps sometimes it sometimes does it and sometimes no. Check in the fault that did not start and the coil released very weak and not constant sparks so I changed the coil but remains the same. I have put the machine and even with the new coil it gives me that it is a failure of the coil. Which when I separate the pins I realized that I had as oil cleaned it and remains the same) if you can help me I thank you very much thanks