Thread: No engine power above 2-3K?

Thanks for all suggestions. I will pull the plugs and possibly replace the wires but it doesn't "feel" like it's missing any on any cylinders. It just won't "go". Is there any good method of testing coil packs without spending $50 per pack to find out? Thx again.

I test the coil packs by removing the boots on the packs VERY VERY SLOWLY, you should hear the spark, DO NOT TAKE THEM OFF, BECAUSE YOU WILL GET SHOCKED. When you do this make sure the boots can still arch, but again do it slowly, because getting shocked sucks pretty bad and will make you jump.

As to the EGR, I know the other engines (3100) have an issue with the EGR passage needing to be cleaned out, I don't know if the same problem exist on the 3800

Well, replaced the plugs and wires, no difference. (What a pain, old wires were practically welded on to the plugs.) Also completely blocked the EGR holes as a test to verify it wasn't a stuck open issue. No difference.
Strange thing is it only happens when accelerating after 2500 or so. Parked I can rev it over 3000 and no issues. If it was a bad coil pack wouldn't it be missing regardless of the engine load?
I drove it for a while with the pedal all the way down at 2500 or so and it finally threw a P0300 code. (multiple/random misfire).
If it is the cat is there a way to verify that with the OBD monitor? O2 sensor readings?
Thx