All it takes is one poor connnection on any of a half dozen sensors for things to go haywire. I made a quick $100 fixing a friends Nissan Z car after one private garage and the dealer could not repair it. I had an advantage he had even bought the factory service manual. The very first paragraph said check all the sensors for corrosion. The car would start run a few seconds then shut down. The throttle position sensor was corroded, by chance it was the 1st thing I checked.Admittedly Nissan and Chrysler are two different brands and two different systems. BTW the dealer told him he had a bent crankshaft, and had charged for tearing down the motor.He had spent more than $1000 dollars. He just handed me the c-note out of gratitude.Nissan has some cool engineering, the PCM is self checking and has a little green light on the case eliminating the PCM as the cause for any problems.