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Just recently inherited a 1994 Grand Cherokee Laredo 4.0L

had been sitting for years, had to replace the fuel pump, brakes tires, a/c condenser, rad, and the ECM.

Got it running, all good. Finally took it for a long drive, filled the tank up, poured a bottle of STP concentrated fuel injector cleaner and drove it home. 15 minutes later, go to start it, nothing. Crank, crank, crank. Won’t fire. Let it sit for 15 more minutes, starts no problem. Drive it around for 5 minutes, come back, shut it off, won’t start again.
Tonight, took it for a long ride, get all the way home, and as I’m backing into the driveway, lose power. Try turning it, crank crank crank, won’t start. Let it sit for 30 mins, come back out, it starts. What’s going on? Got the following codes on the dash, 11,12,62,55. ECM was a remanufactured cardone unit. Could it be the crankshaft sensor? Seems like it’s acting up only when engine is warm and not always.. any help is appreciated.
 

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55 is faulty O2 sensor

65 is power steering switch failure.

11 is no crank reference, possible faulty cam shaft position sensor or crank position sensor. I would check the crank sensor first
 
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