I have a 90 Trooper LS that I have done a 3.4 swap on. Recently and randomly it will refuse to start. That engine cranks over just fine, but there is no spark and no fuel. My friend and I tried to chase down grounds and power leads to see if that was the problem but can't find anything out of place. Worked on it for 2 hours last night with no results, and then this morning went out and it started right up. This is very frustrating, any help or suggestions would be greatly appreciated.