Engine Stalling

[aussiebob]

I'm every now and then having my engine shut off under braking then no problem restarting, its the amazing 88 4.0L power plant and auto trans, any thoughts?.

[Ωhm]

Distributor cap, rotor, plug wires and spark plugs (entire secondary ignition) are all maintenance items. How do they look?

[ThatJeepGuy]

Does it sputter out or just shutoff like a switch?

 

Try replicating it and catch any consistency if its not purely random?

 

While engine is running open your hood and wiggle the wire harness groups some here and there?

[aussiebob]

Shuts off like a switch!.

[aussiebob]

Entire secondary ignition all in great shape!.

[Eagle_SX4]

Have you tried to replicate this will parked? Could be that the ignition wires under dash by the brake pedal get pulled or shorted out when braking.

[89 MJ]

What rpm does it idle at?

[aussiebob]

No tach but idle when warm is low1.

[aussiebob]

Will break out the halogen and check under dash!.

[hgeranium]

I'm with eagle on this one. It sounds like the action of pushing on the brake is cutting power somewhere so +1 to checking at and around the pedal.

[pizzaman09]

Though it doesn't sound like my suggestion, do yourself a favor and check to see if your intake and exhaust header bolts are tight or even all present.  It could just be a vacuum leak causing the engine to stumble off.

[aussiebob]

No all tight!. 

[ghetdjc320]

Does it stall when coming to a stop? Not sure if the Renix used the VSS for the eco or not but that’s what would cause stalling on my HO MJ