What could cause a car to surge and backfire when pushing the gas petal more than half way down?

it's a 1992 jeep chrokee with a strait-six 4.0 liter it starts fine idles ok turns off without running over can't figure this one out

What could cause a car to surge and backfire when pushing the gas petal more than half way down?
worst case scenario burnt valve
Reply:may need a tune up like spark plugs or it good be 2 other things coils are getting ready 2 go or fuelpump fuel filter may need changed
Reply:Spark Plug might have some issue.


Check your air/fuel ratio as well, u might be running rich.
Reply:bad spark plus or a bad air / fule mix most likey the plugs
Reply:bad spark plugs, corroded/cracked valve rings, possibly bad fuel injector/carburator. I would check and possibly change the spark plugs first. It also wouldn't hut to get fuel injector cleaner or even an octane booster. Sometimes it can help get crud out of the lines and injectors. You may want to check the timing on it with a timing gun. It will send out a strobe looking light and you can see where the timing is at. A manual will show you how to use one. I don't think they are too expensive. The only remaining possibility I can think of is something is messed up with your distributor. That's what controls which spark plug fires when according to the position of your cam inside the engine block itself. If this is off at all it can make a difference.
Reply:Have the timing checked, check your fuel filter. Check and make sure all your plug wires are on properly. One may have come off
Reply:What do you meen Turn off without running? I worked on a jeap once that the low voltage wire were broken, the car would start but it would jerk sometimes. It sounds like its and ignition thing, IGNITION TIMING! If the low votage wires are broken it will cause the surge and the backfire! Start the engine ang move the wires around with somthing that you wont get a shok with! If the engine stalls, surges, or back fires you found your problem! If you are haveing a problem with the HI Voltage side of the ignition you might y try looking at the engine at night wile its running and see if you see any sparking! This may sound crazy to you but you may find the problem without spending lots of your cash! Good luck!
Reply:1 Emission system malfunctioning.


2 Incorrect ignition timing.


3 Faulty secondary ignition system component. (carcked spark plug insulator, faulty wires, distributor cap and/or ignition rotor)


4 Fuel injection system malfunctioning.


5 Vacuum leak at fuel pressure regulator, intake manifold, or hoses


6 Valves sticking.
Reply:2 much fuel , check the nut behind the wheel ? loose dist cap ? no cap huh ? sensor dirty ? by the balancer .have you scanned the computer ? O2 sensor could b malfunction ing , bad coil ?