You can try that but if your check engine light is not on it won't help. Try to get the engine hot before you take it through emissions testing. If it still doesn't pass you will have to change the catylitic convertor. I had ths same problem in a 93 Silverado with a 305. You can also try to do a tune up on the vehicle if that hasn't been done in a while. The timing will be the most important part of it because that will determine where the engine fires and how well all the fuel gets burned.
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