Backfiring and hesitation under load

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Drain2

New Member
Hello all! Had to create a new account and decided a new thread would work as well

I have replaced spark plugs, coils, distributors, caps, rotors. And all 3 sensors and plugs with them on the cams and crank. I had a code 31 but that was resolved with new plug for MAF

Sc400 has code 13 hesitates under load and will not rev over 2000 in neutral or it backfires through exhaust. However the engine idles perfectly fine and seems like nothing is up until revved.

Any help? Thanks!!
 


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