http://www.allpar.com/fix/computer-codes.html
P0351 - P0358 - Coil is not reaching peak current at the right time (last digit is coil number, e.g. P0353 = coil #3)
- P1391 - Intermittent loss of camshaft position sensor or crankshaft position sensor
- Rich pointed out that possibilities include a dead or badly installed camshaft position sensor; valve timing out of spec; sensor relearning required with a scan tool; or a damaged tone wheel or pulse ring. ImperialCrown wrote that the cam position is used mainly to synchronize fuel injectors, the crank position is needed to know when to spark. A good scan tool can usually pick up the problem by monitoring the sensors; a bad one will sometimes get “lost.” Timing chain and water pump sensors can cause the code to be set (if timing marks are out of range). The 2.4 engine was known for going through cam sensors for a while (see cam sensor replacement steps)
The catcon catching fire is a sign of running way too rich. The subesequent oxygen sensor code was undoubtedly caused by the removal of the catcon, because without a catcon, the upstream and downstream sensors will read the same, and that trips a code that suggests the upstream O2 sensor is bad. So you probably replaced that for no good reason.
Something is still making the car run rich. Since you replaced the coil packs, it's unlikely (but still possible) that the new coil packs are bad. More likely, they are not being fired properly, so unburned gas is going through. This is probably because of the intermittent crank/cam sensor, which causes the coils not to fire all the time.
It pays to think out the logic of the codes presented and what system controls what, before replacing parts. In this case, I'd suspect the crank or cam sensor causing the other cascading codes. Without proper sensor operation, the coils didn't fire properly (which tripped false codes), the catcon overheated from the raw gas, you removed it (which tripped a false O2 sensor code).
Focus again on the crank and cam sensors to resolve this.
