Rough start and stalling out after sitting but no code

My truck has been starting rough for about 6 months. It doesn't happen every time and it usually occurs in the morning or after it has sat for a few days.

It is really rough sounding like it doesn't want to turn over. then it does but it will stall out really quick and it takes a few turn overs and punching the gas to get it to stay started.

It overall runs beautifully most of the time. I've been having some clutch issues also but they do not seem to be related.

I Changed the plugs recently but that didnt change anything and put a bottle of lucas cleaner through her.
I am also running a K and N air filter that was on when I bought it. likely would have not put that in.
Any thoughts would be greatly appreciated.

 

Check for weak battery, bad plug wires, failed or dirty O2 sensors, dirty mass air flow sensor. My jeep had same issues and it was a weak battery problem but XJs don't like low voltage.

 

I forgot to add I also cleaned the air flow sensor.
Wouldn't the O2 sensor throw a code?I thought about the plug wires but the guy i bought it from said he changed the wires like a year ago now but around 6 months when I got the truck.

 

leaking injector

 

Faulty injectors are a good possibility. Also a vacuum leak. If it was a bad battery, it would not get better with continued tries.

 

year and V6 or 4cyl? Try to determine which injector it is. When it is acting up try starting it them shut right off. Let it run maybe a couple seconds. Needs to be very first start. (first start in the morning ) Then pull plugs and check for wet or black colored electrode.

 

EVAP system is a possibility.

 

EVAP? Thinking the purge valve is stuck open, causing vacuum leak?

 

Maybe, not just vacuum but gas fumes causing it to be rich. But that should set a code for high flow.

 

Please no evap! Ill check the injectors. My first thougt was air system. Wasnt familuar with the k and n filters and issues related to them.