Throttlebody/Intake Backfiring

[Mattwheels]

So I've got some throttle body/intake back firing from my 4.0 and I can't figure out what it is, when you give it gas it kind of stumbles and back fires through the intake.

Whats new 
Fuel pump, injectors, TPS, MAP, O2, Coolant Temp Sensor, Distributor, Plugs, Wires.

[cruiser54]

AThanks for your post.

 

We’re here to help but you must understand that all Jeeps are not the same. 

In order for us to give you more accurate advice and help, we must know the following, as applicable, along with detailed information as to the symptoms/problems etc:

 

Year

Model

Engine 

Transmission 

Transfer case

[HOrnbrod]

^^  Nice way of putting it. OP, create a signature in your profile detailing the year, model, and engine at minimum in your rig to eliminate the guessing game.

[Mattwheels]

Ah yes, I forgot the Meat section!

 

1989 MJ 

 

1991 4.0

1996 Ax-15

1989 Np231

[cruiser54]

Ah yes, I forgot the Meat section!

 

1989 MJ 

 

1991 4.0

1996 Ax-15

1989 Np231

Good. Still using the original fuel injection system? 

 

If so, click on the link in my signature and do posts1,3,4, and 5 just to be sure that's not causing an issue. 

 

Have you tested fuel pressure even though you have a new pump?

[cruiser54]

^^  Nice way of putting it. OP, create a signature in your profile detailing the year, model, and engine at minimum in your rig to eliminate the guessing game.

Better than my old way?

 

Sounds harsh but just makes sense:

 

“Let’s play a game.

 

You pretend that you are the only one that knows what year/engine/model, etc that you are asking about.

 

We will all pretend you never asked a question until you provide at least the bare minimum of information about your vehicle”.