Old fashioned way is to pull plug wire and listen for the miss. You'll have rough or slower idle. Be well insulated and not grounded or you may feel the shock. There is also a cheap tool you can buy for 5 ish dollars. It will connect to spark plug and end of spark plug wire. Basically you pull the wire off the plug and put this tester between the wire and plug. Start the vehicle then look for spark on you new spark testing tool
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Old fashioned way is to pull plug wire and listen for the miss. You'll have rough or slower idle. Be well insulated and not grounded or you may feel the shock. There is also a cheap tool you can buy for 5 ish dollars. It will connect to spark plug and end of spark plug wire. Basically you pull the wire off the plug and put this tester between the wire and plug. Start the vehicle then look for spark on you new spark testing tool