Engine, Drivetrain & Forced-Induction
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Help Mystery jerking and lag

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Old Aug 9, 2023 | 12:51 AM
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Speed_demon808
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From: Hawaii
Mystery jerking and lag

So maybe y'all have an idea bc I'm all out of ideas
I have an 2012 coupe base model A/T. Mods are resonated test pipes, engine is stroked, cold air intake, haltech ecu and tuned obviously.
It started with the car intermittent jerking under heavy loads at high speeds. Now it even happens intermittently when I just cruise.but only under acceleration. Additionally to it I have an intermittent lag when I accelerate from a stop and when I brake hard and come to a stop it's like the transmission has to play catch up shifting down from 2nd to 1st. 1st gear usually kicks in when I'm already at a stop.the jerking is neither rpm nor gear dependent
No power loss tho and zero codes.
Now 3 weeks ago I suddenly had an P010B no power. Unplugged it plugged it back in deleted the code everything was fine. A week later I got P010B and p0101 Code. Same thing unplugged it plugged it back in deleted codes everything normal. And then yesterday I got a p006a code. Same thing again unplugged it plugged it back in and nothing since. I resetted the mafs a couple of times and the jerking gets better for a day or 2.So I swapped maf with a friend but the lag and jerking is still happening. The coils and plugs are new, I swapped throttle bodies as well they're fine no dead spots or anything , abs module is fine, ecu and tune is fine, The tcc is fine, AT fluid and filter is new, no vacuum leaks and brand new fuel pump.
Im grateful. For any kind of ideas at this point

Last edited by Speed_demon808; Aug 9, 2023 at 01:01 AM. Reason: Forgot to mention something
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