Vehicle under test, Nissan teana 2010 with a 2.5 v6.
I made two multi probes approx. 12 inches long made with brass strips 5/8 wide by 1/8 thickness. The Brass strip was wrapped with electrical tape and a lead connected to a female banana jack for connection to the scope.
Video I followed for my build.
The vehicle had a misfire under load, car was placed in drive, break pedal depressed and the miss showed up intermittently. Very surprised how this turned out.