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I have a 2005 Grand Am, V6 Se.
Recently, after having sat for 3 days without being driven, it was slightly hesitant to take gas on pulling out from its parking spot. I didn't think much of it, and continued to drive home. Engine light came on. Then it got worse. Eventually, it was shuddering and emitting black smoke when I'd give it gas. At idle, it was fine and still is. If you rev it to above 2000 rpm, the tach gauge jumps all over, up and down, the car shakes, and it makes sputtering/backfiring type sounds.
As a quick fix, we went with changing the plugs and wires. No change. Pulling each plug/set of coils seems to make no difference -- instead of cutting a third of the spark as expected.
I bought a scanner (since it's half an hour to the nearest one, and it was cheaper than the tow bill home if things didn't go as planned).
Got the following codes:

P0300
P0350
P1350

So am I just looking at replacing all three ignition coil packs?
Do I need to go for the Ignition Control Module?
Or the Engine Control Module?
Or something entirely different?

Any insight would be greatly appreciated, as I'm trying to do this on a budget.

Vehicle: 2005 Pontiac Grand Am, Se, V6

1 Answer

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P0300 Random misfire

P0350 Ignition coil primary / secondary

P1350 Ignition coil primay / secondary

There is only 2 possibility  that you have . When the engine is at the cranking position the fuel injector and the ignition spark is done at random.until the engine  catches. Once it catches the PCM  switches to the mode from the ECM to respond to spark timing all this is done in miliseconds.In this case it is not performing its timing sequence and it is still sporatic. The problem is with the ICM (ignition control module) many times it is a failed connection at the ICM due to spread out spade terminal.

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