Multiple strange electrical problems

I'm experiencing multiple electrical problems. The service engine soon light came on at around 52,000 miles in my '99 maxima. Multiple strange problems came with it. The blower motor doesn't always come on when I start the car, the air bag light is flashing, sometimes the TCS shuts off and the car is rough when the engine is idling in D or R. I pulled codes off of the ECU and got three codes back:

Ignition Signal Circuit
Multiple Cylinder Misfire
Knock Sensor

I've ordered the Haynes repair manual but in the mean time I was wondering if anybody else has experienced any of this. Do I need to replace all of the ignition coils or is there something better to start with?

I had similar problems with my 99 GXE. I took it to autozone and had them pull the codes for free. My codes were #2 Cyl Misfire which also caused the Knock Sensor and Engine Ignition codes.

I replaced the #2 ignition coil for $65 in parts. The ignition coil sits on top of the spark plug. If you have ever replaced the spark plug this is the 4-6 inch rod you remove after unscrewing two screws. On a scale of 1-10 this was a 1 in difficulty. Here is the firing order from the dealer.


1 3 5 Left Side
Belts
2 4 6 Right Side
R A D I A T O R

It sounds like you need to replace a few Ignition coils. Good Luck.