ANSWERS: 2
  • You have three ways to find out the answer to your question. 1st call your local GM (Chevy) Dealer and ask for service department and ask them. 2ndGo to local library and find a Chilton Auto Repair Manual. 3rd find the internet search engine ASK.com type in what is the engine firing order for a 1991 GMC 4.3 l engine.
  • Stamped on intake manifold

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