I have a 99 Xj 4.0L. When I'm driving and slow down it dies and when I start it and let it idle it runs for a bit and then it's idle gets bad and jerks and dies, does anybody have any ideas what can cause this?
Are all the tune-up parts fresh ? The problem might be a battery issue, a failing O2 sensor, or a faulty Crankshaft Position Sensor. Start with the cheap and easy stuff. Test the sensors before you invest in any new parts.
Stalling can be caused by a low voltage issue from:
a failing battery
a failing alternator
dirty or loose wire connections
internally corroded battery wires
Perform routine maintenance of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Copper wires should be copper color, not black or green. Do the same for the grounding wires from the starter to engine block, and from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to. Jeeps do not tolerate low voltage, bad connections, or poor grounds.
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