Re: spark at the plugs
Hummm. "Always the same cylinders" acting up. Tell us which 4 cylinder numbers seem good and which numbers seem bad so we can compare to the firing order. Sounds like something off inside distributor cap(s). How are your plug wires and their connectors ? Clean inside of distributor cap ? OR if you have a spare distributor cap and/or rotor try changing them. (may be arcing at low rpm but doesn't show at high rpm)
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