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If you know the distributor cap, plugs, and wires are good then I would suspect a burnt valve or blown head gasket. A compression test will verify this. Remove all plugs, coil wire, and run a compression test on all cylinders. If # 4 & 6 are out of line with the others, you will need to remove the heads and find out what is causing this.

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Q: 1993 Chevy pu w 350 will not firing on 4 and 6-cylinder it has fire to plugs but will not fire in the cyl any info would be appreciated.?
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