I believe your problem rests in the ECU. Encased inside the plastic covering is a circuit board covered with a protective layer of jel. If you remove this protective coating and access the circuit board you will find a collection of computer components. Your problem rests with the three capacitors on that board.
All you need to do is to purchase three of the same capacitors - available at Radio Shack and other electrical suppliers - and swap them out. Of course, this means desoldering the existing connections on the old ones and then soldering in the new ones. Once completed, your troubles should disappear.
The total cost of these capacitors should be less than $7 and it's not as difficult to do for a DIYer. What do you have to lose. If it doesn't work, you've lost nothing since the ECU wasn't any good anyways.
I did this and I have no special talent other than a curious nature. There are better instructions available on the net in Jeep forums.
Tuesday, December 11th, 2012 AT 12:45 AM