The crankshaft sensor on my jeep is going out.
That is a pretty common failure on the 4.0 engine. Random stalling, long crank, rough idle, or the engine failing to start are all symptoms. Usually a code is stored, but this is not always the case. If you would like this inspected or repaired, consider having a certified mechanic, such as one from YourMechanic, diagnose your vehicle and replace your crankshaft sensor if needed.
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