I own an 87 YJ with the 2.5 4 cyl with a 5 speed. It is fuel injected and is bone stock under the hood.
Here is the issue. When you get in it and turn the key it tries to fire over but it will not run. It tries and tries but nothing. Sometimes if you pop the spark plug wire off the spark plug closest to the radiator it will fire over on three cyl. you pop the plug wire back on and you are good to go. Sometimes it will restart all day long, other times it will not restart right after you shut it down.
I checked the fuel pump and it is getting fuel, pressure in the lines. It is getting spark, I checked everything including changing out the coil. I also thought it might be the cam position sensor so I swapped that out as well. I would say it might be the timing but I do not think so as when it does decide to start it purrs like a kitten.
Does anyone have any ideas on this issue? I have one idea left but other than that I am clueless here.