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1994 Chevy van, why is it backfiring?

I

Ivan Cornejo

Junior Member
I have a 1994 Chevy van g20 with a 4.3l. I had the timing done last week, took it on the highway and when it hits about 70 mph she starts backfiring. What could it be?
 
Have the timing checked, might be set wrong. With a stock system, once the timing is set correctly , it should never change unless something is worn or failed.
 
Could be many things. I had an older car that backfired simply because the spark plugs faulty.
 
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