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1991 Cutlass supreme LS 6 cylinders firing order is 123456. This is V6 engine, While looking at the motor from the front, number 1 cylinder is on the inside of engine compartment near the firewall. The 3 Spark Plugs facing you directly are (From left to right) 246 and the ones in the back, (firewall)are 135. To have an easier access to the ones in the back (firewall) you will have to loosen the Front mountings and either strap pull the motor forward or push the vehicle while in Park and jam the front wheels from behind with a stopper. This will make the motor tilt forward and create an enough space between the firewall and the motor. When using Spark plug wrench, you will need 2 extensions; longer one and a shorter. The spark plugs are not facing outward straight, they are slightly slant.
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