About month ago fuel injector went out. Had it replaced now I’m getting code po455 po300 one large vacuum leak (been chasing the vacuum leak for awhile replaced cats twice evap can and purge siliniode) the other is multiple cylinder misfire. I did have bad spark plug wire I replaced awhile ago just one though not all. Could I have bad spark plugs think first thing change all spark plugs but I’m also getting every once in while red lightening bolt and traction control light on same time I literally about sell this jeep every month something is breaking its 08 jk