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Had a misfire on cylinder 4 compression low pulled the head found burnt exhaust valve replaced the head timing chains while it was apart ran great for few days now cylinder 4 is again misfiring at idle tested coil good switched fuel injector on 4 with 2 misfire still on cylinder 4 replaced intake gasket throttle body gasket cleaned throttle body no other codes present just p0304 also checked compression on 4 185 and did leak down test also passed I'm at a loss here any direction appreciated.
