[Healeys] Backfire

[Richard Antal]

Gents,     A few days ago I replaced the sparkplugs, ten years old or more, with six NGK BP5ES plugs gapped to 35, and a Pertronix 3 ohm coil. I've not yet changed the wires, distributor cap or rotor. Today I drove the BJ8 almost 200 miles without incident at speeds up to 60 mph. While going 80 mph on the interstate, over a span of two or three seconds, the car bucked and backfired three times. I immediately dropped the speed to 50 and then gradually back up to 80 with no further backfiring. What could have caused this discomfiting turn of events? Thanks for your thoughts.rich antal
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