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Originally Posted by sethhatfield
Alright. Swapped #8 and #5 spark plugs and still got a P1357 which is a #8 misfire. No other codes! Aaarrgghh!
When you floor it, it won't shift into 3rd gear because it won't rev up past 4000 rpm. If you let off the throttle a little, it shifts normally. Not a transmission problem just the engine isn't revving up under a load.
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Misfire could be due to bad coil, spark plug, injector, or low compression. Since you swapped the plug and the misfire is still in the same cylinder I would
1. Do a compression test of Cylinder 8
2. Swap the coil with another cylinder and see if the misfire doesn't travel with the coil.
3. see if the injector is working in cylinder 8. You can use a stethoscope to listen to the injector to see if it is clicking.
Engine won't rev under load, sounds like you got plug cats.