92 Chevy Wiring Diagram - Firing order: 1-8-7-2-6-5-4-3. The firing order of the LS1/Vortec V8 has been revised from the Gen I and Gen II engines. This was done to provide more power, less crankshaft rotational stress and better emission and idle qualities.. 96 Chevy C1500 5.7L Vortec Truck won't start, Replaced Fuel Pump, Filter & Has Spark. - Hey everyone, I have a 1996 Chevy C1500 with a 5.7L Vortec, I got. 1991 () was a common year starting on Tuesday of the Gregorian calendar, the 1991st year of the Common Era (CE) and Anno Domini (AD) designations, the 991st year of the 2nd millennium, the 91st year of the 20th century, and the 2nd year of the 1990s decade. It was the final year of the Cold War that had begun in the late 1940s.During the year, the Union of Soviet Socialist Republics fell.