On my 1990 gmc truck with a 5.7 liter V8 i have a dead miss. I replaced the plugs, wires, rotor button, distributor cap & egr valve. It still misses I have set the timing per mfg's specs and still misses and I dont hear any vacuum leaks, so if anyone could help me out i'd appreciate it.
Possible leaking head gasket that fouls the spark plug. Try adding a can of Bars Leak into the radiator. It will seal the water leak in about an hour.
Check the compression on each cylinder. Also check for proper valve operation. You may have a flat cam lobe or bad rocker arm on either the intake or exhaust side which will give the rough idle you are experiencing.
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