Mazda 323f (BA) V6 (KF) engine rattling from top of engine. Drove to 6500rpm with low oil then it started this, just when i'm maintaining speed or slowly accelerating in low gears, Most noticable between 1500-3000rpm. Then i took out No. 6 HT lead and the spark plug looked bad and cannot be removed ive also added a pic of a good plug. But now when i accelerate (medium/hard) then the engine dies, it ok if accelerated slowly apart from rattle. Any suggestions appreciated.
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