norcal2jz

Hey everyone so I have a 95sc300 with a 1jzgte swap with r154 and im having terrible starting issues !! Car was working fine for a whole year and suddenly it doesn't start anymore .... Have checked all relays and igbition...tomorrow I will be pulling a spark plug to see if they are in good condition ...also ordered a new fuel pump....I have a scary feeling it might be the harness issue also....
Any tips help would be great thanks !!!