Misfire cylinder 3 help!
Well thanks in advance for reading. I have got a 2003 Ram 1500 with a 3.7L with a p0303 code. I have done a tune up, swapped coils,and even changed the injector. The misfire only happens at idle, under a load there is no misfire. (I have a scan tool thats why I know.) I did a compression test I had 90 on cylinder #1, 120 on cylinder#3,and 170 on cylinder#5. Which is weird no problems on cylinder#1 at all. I also did a vacuum test which showed 20HGm and the needle stayed still. The question is does this sound like an internal engine problem, a computer issue, or what? Again thanks in advance,if there is anything else I should check please feel free and ask or tell me to do. I am kinda lost right now with this.