Car shaking in all gears under load, including reverse but not park or neutral(3.0V6)

[Alexhart711]

Hi, so I have a 3.0, and it's been running perfectly up until today. Today, after a 10 minute drive (which was normal), the engine would start to shudder getting past 2500 RPM and then the flashing CEL happened. What I've been reading is that this is most likely a coil pack issue, yet it has no issue idling in neutral or park. It shudders in reverse like the tranny is slipping, yet when in neutral or park it can be revved up to 5-6k with no issue or shaking. So, my question is does this sound like it could be coil packs, even though it only happens under load? Or is it a whole different issue? Thanks so much in advance guys.

[old guy]

I have had several coil packs go bad only when under load. Idled fine but misfired as soon as I pushed it a little.

[hightime80]

Peel back the rubber boot in the coil pack and the condition of the harness. They are notorious for going bad due to the constant baking.

[MacFady]

I will second the statement that any coil I have ever had go bad only gave me a flashing CEL when under load. What cylinder is it throwing a code for? Swap the coil from that cylinder with another to see if the code switches cylinders too, if not start inspecting the wires to the cylinder in question.