My 1994 Jeep Cherokee has a diagnostic code 22. It has a hard time starting and staying on. I changed the idle sensor wtill having hard time idling
That code is for the engine coolant temperature sensor. "...input above maximum acceptable voltage." I would try a new temp. sensor. If that doesn't fix it, you may need to have an engine scanner hooked up, and see what the sensor is sending to the computer, and go from there.
A bad coolant temp. sensor can cause hard starting like your symptoms.
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