Bad ecu?

[upinsmoke]

I have a 93 s13 with a 96 s13 blacktop engine. Lately I have been having a problem with the engine running really rich, not being able to rev past 3k rpm, a lot of smoke at idle and just running like crap. It recently occured to me that the ecu could be bad because i had a mechanic look at it and its definatly dumping way more fuel through the injectors than it should be. So this is probably because of a bad ecu. It is the e5 ecu. Im just trying to get somebody elses opinion before i try to buy another ecu and try this out. So let me know what you think. thanks.