Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Thanks for the question.
Your 4.3 actually has whats called "Spider injectors". These are located under the black upper intake manifold, located below the throttle body. You will have to pull off the upper intake to access these and replace the one that has failed.
I have circled the spider injectors...
I hope this helps.