Guerrero akadzoka neChikwata cheCotter muna 1986 kuzotyaira yavo Nhamba 2 True Value / Emerson Electronics March 86C-Cosworth DFX (nhamba 5 kuIndianapolis chete). Guerrero akaenderera mberi nekuguma kwake kunoshamisa nenzvimbo yechina munhangemutange
. Guerrero akawanawo maviri e2nd-nzvimbo yekupedzisa, kutanga paEscort Radar Warnings 200 kuMid-Ohio Sports Car Course uye Miami Indy Challenge 200 kuTamiami Park. Muchikamu chekupedzisira Guerrero akakodzera panzvimbo yepamusoro uye akatungamira denderedzwa rega rega, kunze kwekupedzisira denderedzwa nekuda kwekupera kwemafuta uye kupa kukunda kuna Al Unser Jr. Guerrero akapedza mwaka wechi9 mumapoinzi aine mapoinzi makumi masere nemanomwe.