The intermittent rough start

[Brisbanejeeper]

I bought my jeep 1 year ago and it has an odd rough start problem it only happens when the engine is hot but the fule pump is fine the pressure is fine and no code trigger it
Cranks fires then dies immediately then I try it again and it starts fine as if their is nothing wrong I've taken it the steelership nothing found several mechanics and still no one can find what's causing it but it has been happening for a year and is completely random the jeep can go weeks even months with no issue and their are days that it will happen every time on start up anyone see this or similar issues
Jeep description in signature

 

[teeje]

Rey some techron cleaner. Common if the injectors are dirty. Change the spark plugs yet? Usually the first thing to do when you buy a car


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[Brisbanejeeper]

I Changed the spark plugs in the lot before driving it home
In march oil change 2 hrs later and did an injector clean out and test three months later replaced 2 of them that same day

 

[Brisbanejeeper]

When I bought the jeep there was more tape and superglue then jeep the dealer I bought it from.was realy shady and had no knowledge of the jeeps specs or its status bought the truck blind but i overhauled it back to safe driving
I could tell you the horror I found when I arrived but it's a long painfully boring story

 

[LibertyTC]

Clean the throttle body & clean or replace the IAC see if that makes any difference.
What spark plug part# did you use? Gap them correctly?
Go back & check to make sure plugs are still in there tight.
What was the fuel pressure readings?

 

[HoosierJeeper]

Vapor lock? I get a similar thing sometimes.

 

[renegade 04]

You should replace the pvc valve and make sure to remove the baffle thing from inside of your filler neck. I had the same problem before I did this.

 

[Brisbanejeeper]

I found a broken hose connected to the valve cover . I was told it's the crankcase vent to the air box could that cause any problems. And I'm thinking of replacing the throttle body with a ported one any suggestions or should I clean it replace the IAC and call it a day

 

[Brisbanejeeper]

I had my mechanic check it he didn't tell me what it was he just said it was fine I'll ask him to tell me the reading im going in next week for an alignment check for my (experimental )spacers