Kammala jumla mai zuwa: Guerrero ya dawo tare da Team Cotter a cikin 1986 don tuƙa lambar 2 ta Gaskiya / Emerson Electronics Maris 86C-Cosworth DFX (lambar 5 a Indianapolis kawai). Guerrero ya ci gaba da jerin abubuwan da ya yi na ban sha'awa tare da matsayi na 4 a
tseren. Guerrero ya kuma zira kwallaye biyu na biyu, na farko a Escort Radar Warnings 200 a Mid-Ohio Sports Car Course da Miami Indy Challenge 200 a Tamiami Park. A karshen Guerrero ya cancanci matsayi na farko kuma ya jagoranci kowane zagaye, sai dai zagaye na karshe saboda rashin man fetur kuma ya ba da nasara ga Al Unser Jr. Guerrero ya gama kakar wasa ta 9 a maki tare da maki 87.