1998 Honda Passport engine stalling

My vehicle started cutting out while driving. Over time it would stall more and more but start rite back up. The drive time became shorter and shorter until now it only runs for 10-15 seconds at a time allways starting rite back up. I was told by a mechanic that since it is getting fuel I should change the computer. I tried used computers twice and the truck would not even start with either. When I placed the old one back it would run for 10-15 seconds again. When I first start the vihicle it will run for approximatley 60 seconds and then returne to the short span. I'm puzzled, can you tell me what to look for. Ron Wynn.