why why my 92 chevy 4.3 not start getting gas and spark
Your getting spark at all the plugs? The distributor rotor turns when you crank it? Did you use a gage to check proper fuel pressure? In the past, I've seen injector spray patterns that looked good to me, but, the fuel pressure was half of what it should have been. Can you check for applicable codes? Your obd1, you should be able to check some codes, yourself, if there are any. Do you have good cylinder compression?
Just to add, your battery has a full charge and all that good stuff?
it has all good spark and fuel pressure I check
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