I need a code cheak

most codes are generic and then their are codes that the manufacturer will have as specific 1391 for a mopar may be different for a toyota or on a ford its a glow plug problem etc --------That code for mopar for the crankshaft position sensor or the CMP sensor once the CKP sensor goes your car wont start at all-----

The cam and crank sensors have the same power wire. Go after that one. They also have the same ground, but other sensors connect to it also. So it's not the ground. And they have separate return signal wires. Not them either.

You could've gotten dirt or grease inside the cam sensor connection. They are real fussy.

Not sure I am following your story.
Code 351 is a problem with the primary OR secondary circuit for the coil.
Code 1391 is a problem with the ABS system.

po 1391 is crankshaft sensor or cam sensor change crankshaft sensor

it does sound like the ecu is bad the only other thing it could be is the antitheft system is having problems

Code 1391 = An intermittant loss of CMP (crankshaft position sensor) or CKP (crankshaft position sensor. This code could be related to just a bad connection at either sensor or the wiring harness, check the connections and be sure they are clean and tight fitting with no loose wire connections also within the connector itself. Otherwise you may end up replacing one or both of theses sensors to correct this issue,unless you have an oscilloscope to isolate which sensor.

1391 is a timing code cam or crank sensor
0134 bank 1 sensor 1 usually left front but double check
1684 doesn't match anything i know

The code 1391 is : Intermittent loss of CMP or CKP

You are losing either the cam or crank sensor intermittently. Test and replace as needed. Check plug ends first.

P0700 its a transmission codefrom what i understand while the 1391 is a crank postion sensor. the P0700 comes up when the neutral safety switch starts to fail, but the crank postion sensor...to get that error code, means you timing could be off..have you replaced a timing belt lately, if so, it might be a couple of teeth out, that might do it. i would check the sensor too though