it had a ls/vtec and it ran fine, i pulled it and put a b18b1 and hooked all the wires back up, the only thing that is not hooked up is the knock sensor and the thermastat sensor..... it fired a couple times and wouldnt idle, kept dieing off without gas. now it wont start at all, its got fuel, its got spark.... i dont know what the problem is....any suggestions would be great let me know something, also i have a pr4 ecu in it now.