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I've been getting the same exact problem. Everytime I floor the car on the highway with my JB4 on map 1....check engine light goes on (stays on, no blinking), the car still runs but the engine shakes as I press the gas. The light disappears when I turn off the car and put it back on.
I was thinking it was the HPFP, I went to my local garage and they attached the error coding system but they couldn't find the error code. I tried driving it hard with the JB4 turned off to see if the light would appear, but it stayed off.
Really want a solution for this! Hate to have a JB4 that is not functional!
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