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engine missfire?

My engine is missfireing on cylinders 1and2.
3and 4 are perfect.
I have reset the timing. Changed the plugs. Checked the HT leads.Checked the coil, ditributor,and roter.
At one stage having put new plugs in 1/2 it seemed ok
according to the strobelight. Then by putting new plugs in 3/4... 1/2 stated to miss again?
gordon smith, August 2010
Could be the plug wires, or headgasket (between cylinders).

Fred, August 2010