I have to floor it to start .After its running then its fine.It's a 96 4.0 AW4 4x4Cherokee Country.Whats the problem? The battery was replaced this year with a 8 year warranty and my volts are at 14 and no CELs.It only has 83k original.

 

I had to floor mine..... bummer man

 

lol completely read that wrong haha I thought it said floor it as in legit floor it my were rusted out

 

My friends '98 did this the other day it would start with about half throttle and then it would only stay running if you gave it gas. We took off his IACV (Idle Air Control Valvel) and cleaned it out and it ran great.

To do this you just need to take off your throttle body, careful not to tear the gasket, and remove the IACV (round tube looking sensor on the left if you are looking straight down). When you pull the sensor out it looks like a plunger and you can lightly wipe or brush the carbon out and spray it with brake parts cleaner or carb cleaner.

Worth a shot.

 

Mine runs and idles great after it starts and my IAC is newer.I replaced every sensor and I mean every one recently.I went wheeling last weekend and noticed a leak afterwards around the gas pump seal.Could that be my problem? I put a brand new tank in it 3 weeks ago.

 

My 93 Sport did the same thing. Replaced the Fuel Pressure Regulator on the end of the fuel rail, and all is well.

 

TPS. I've got the same vehicle, had the same problem.

 

mine was doing the same thing check the rear vent on the valve cover and see if it is colasped in on it self , one day try starting it with the rear vent hose removed from the intake and it should start right up

 

I would check the IAC first, it's easy to clean. After that, check your TPS. Ensure that all connections are tight and clean.
Your gas pump seal shouldn't stop the car from starting, it'll usually cause a check engine light, unless there's not enough pressure getting to the injectors.

 

I think it's the manifold temp sensor.I'll let you know tomorrow.Thanks for the help guys.It starts and runs great when its cold.

 

I pulled the MAT sensor and cleaned it really well and all is good.

 

How did you know it was the manifold temp sensor?

 

It would run perfect until it warmed up and then it would stall and only start if I put it to the floor.Let it cool down and it ran perfect again.All my other sensors are new so it had to be that.