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Misfires, misfires, misfires

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Old Aug 14, 2025 | 07:50 PM
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dmm2k's Avatar
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1st Gear
Joined: Feb 2017
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Default Misfires, misfires, misfires

I know this has been beaten down. Like I am beaten down.
AUDI A3 148K. Just replaced spark plugs and Coils. It is not these.
Consistent and MIL ON cylinder 1 and 4 are my problem children. P0301, P304, P0300.
Compression test on all cylinders is good.

Logical next steps? I am thinking FUEL/ VACCUM LEAKS/ CRANK Sensor?

Please help. Car runs great when it gets going. What seems to trip this off are some seriously ROUGH STARTS when HOT. Barely starts. Putters out often, restarts itself and then it rides fine. The cylinder 1 and 4 have been the most consistent MIL ON errors since inheriting this vehicle. Thanks!
 
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