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On the 2.0 and 2.4 engines there is an ignition module that fires the coil from input from the computer and sensors. You may have to get a shop manual to have the testing procedures needed to check the module.
Sorry I do not have a pic but the information I just read says that on either engine that car could have came with the Crankshaft Sensor is located on the transmission case next to the flywheel. I hope this is at least a little helpful.
Try replacing the "Crank Shaft Position Sensor" this two sensors "Cam" and "Crank" communicate so if one is acting up it sends the wrong signal to the computer, I recently had the exact same problem but in reverse and a different vehicle, the other thing, although not very usual is the wire harnnes that connects to the sensor itself could not be working properly. Good Luck!
P1391 is a timing referance code, your timing is crucial to engine operation, this can be caused by the crank and or cam position sencer. If you changed these and the problem still exists, maybe you got ahead of yourself. These two (2) sencers run in conjuntion with each other, if one is out of whack for any length of time, The ECU will trip and pretty much say to itself, The Timing chain is broken, fix me! Also note that these sensers are typacaly LOW FAIL items. So on especially vehicles with the 2.5Ltr. V6, If you suspect a sencer is bad and you change it, might be a good idea to change both sencers and the timing belt since like all belts it may be streching.
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