I had a case of backfiring caused by a bad spark plug. The carbs had been
put together by a young kid and had got the pistons mixed up and they would
not lift once the engine fired. The piston vacuum hold was in the wrong
place and if you started the engine without lifting the piston by hand it
would not run. I changed the pistons and the car would run but had a bad
case of backfiring. I found #2 spark plug dead. Replaced it and the engine
runs nice and could adjust the carbs.
Pat 1965 1500
1966 1600
Portland or
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