SOURCE: 93 chevy g20 van
More than likely it's the distributor. They have a tendency to build up corrosion and rust and have personally went through the same situation three weeks ago on a suburban. Check to see if you are getting spark from the distributor first. Have the ecm in the distributor checked at Oriellys for free. It's under the rotor and has two 8mm head bolts with wires plugged in at each end.
SOURCE: Firing order of the distributor and of the plugs
Here is the diagram for a 1992 Lumina 3.1 Litre engine with a distributor.
SOURCE: I just changed the plugs and wires on a 94 Chevy
Here is the firing order for the 1994 Chevrolet Lumina APV Van with a 3.1 Liter engine with a distributor, and the 3.8 liter engine had the coil packs, and let me know if you need any help to understand this diagram, or if you require any further assistance.
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