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The diagram you have is correct. Number 6 is the cylinder to the far right and next to the radiator. The firing order is how the plug wires are connected to the distributor cap or coil. Keep in mind if you have a trouble code 306 it could also be caused by a faulty injector or mechanical problem.
FIRING ORDERS NOTE: To avoid confusion, remove and tag the wires one at a time, for replacement.
Fig. 1: 2.2L and 2.5L engines Firing order: 1-3-4-2 Distributor rotation: Clockwise
Fig. 2: 2.6L engines Firing order: 1-3-4-2 Distributor rotation: Clockwise
Fig. 3: 3.0L engines Firing order: 1-2-3-4-5-6 Distributor rotation: Counterclockwise
Fig. 4: 3.3L and 3.8L engines Firing order: 1-2-3-4-5-6 Distributorless Ignition System
Fig. 5: Distributor cap terminal routing (view from top of cap) - 3.0L engines
Here is the firing order diagrams for the 4.3 liter V-6 engine and the 2.2 liter 4 cylinder engine, and let me know if you need any help to understand these diagrams, or if you require any further assistance.
301 & 306 are cylinder #1 and #6 misfire. Your spark plug wires are not in the proper firing order in relation to the correct cylinder and distributor locations.
Sounds like your timing is off when you placed the distributor back in or your spark plug wires are crossed. Start with the simple and check the spark plug wire firing order. 1-8-4-3-6-5-7-2 Cylinder numbers drivers side 1-3-5-7 radiator to firewall. Cylinder numbers passenger side 2-4-6-8 radiator to firewall. Distributor cap #1 is at 5 O'clock and rotates clock wise. Once that is establish to be good then make sure the cylinder 1 is at TDC with the distributor rotor at the #1 position. Good luck and hope it's a crossed firing order.
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