Spark plug Autolite or AC DELCO

AC DELCO Spark plug

Put them into a stock '87 Subarban and tore my hair out thinking I messed up the wires 'cause it idled so bad. Really, like I had two wires switched. Put the old worn regular AC's that I just took out and it idled perfect.

Cons: bad idle, rough running
Vehicle: Chevrolet Suburban
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