Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Do we know exactly how far off the timing was? This is a valve bender if you are off more than a few teeth.
Can you get a compression test and see where we are there?
The computer won't cause the symptoms you have normally. They will fail catastrophically and lose ability to run entirely, but for conditions where you are getting odors while driving and poor running condition this is not consistent with any computer failures on this particular model (or even most Mitsubishis in general).
Please let me know if you need further assistance.