Theres few things to look at
check plug wires for tightness
check the rotor cap. if secured, looking for cracks in case of rotor cap, remove the spring loaded screws to the cap look inside the cap looking for crack, burned parts, each connected all look a like, replace rotor cap, with a v-8 firing order i find it hard to have an issue where all cylinders are just firing on one side. if this is the case
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ignition box or system
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it is the rotor cap and condenser and computer this is a free service. If you are AAA member they do the test for free
depending where you live in this country state and city, some auto parts stores have device called trilingual code reader, they plug it into the car and it goes to the computer troubleshoots the car, gives them a code, if they have the parts they sale it to you and help you install the part if it is easy fix, major work they dont do that work.
or
they will tell you that that is a dealers part only and you have to go to the dealer or call car recycle parts store see if they can get you one or its a dealer part only.
used parts salvage yards, online, ebay,
Fig. 2: GM (Oldsmobile) 307 (5.0L) V8 GM (Oldsmobile) 350 (5.7L) V8 w/EFI Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: counterclockwise
Fig. 3: GM (Buick) 252 (4.1L) V6 Engine firing order: 1-6-5-4-3-2 Distributor rotation: clockwise
Fig. 4: GM (Cadillac) 368, 425, 472, 500 V8 Engine firing order: 1-5-6-3-4-2-7-8 Distributor rotation: clockwise
Fig. 5: GM (Cadillac) 429 V8 Engine firing order: 1-8-7-2-6-5-4-3 Distributor rotation: clockwise
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