Hi and welcome to mightyram. Bunch of things could be wrong. You've worked on an Eclipse so you know your way around fuel pressure and coils etc. DSM's are getting old and they have their fair share of electrical issues. The Mighty Max is notorious for bad ECU's - it's the brand/type of capacitors that were used in them and they are prone to leaking. Crack the ECU open and look for telltale signs of swollen capacitors and leaking/stains on the circuit board in the proximity of the capacitors. Just google "faulty capacitors in Mighty Max ECU's" and you will find that the first images trace back to this site. PDF is here
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