Dee ihe na-aga n'ihu maka paragraf a - Tupu afọ 1990 Morales Motorsports mechiri ma Patrick Racing weghaara ọrụ Alfa Romeo na Guerrero na-anya No. 20 Miller Genuine Draft March 90CA-Alfa Romeo Indy V8. Guerrero jisiri ike ruo eru maka Indianapolis 500
, bidoro n'ọkwa nke iri abụọ na asatọ ma mechie n'ọkwa nke iri abụọ na atọ n'ihi mmebi nkwụsịtụ. Ndị otu ahụ gbanwere iji &lt;a href="Lola%20Racing%20Cars"&gt;Lola T90/00&lt;/a&gt; malite na Marlboro 500 na Michigan International Speedway. N'ọsọ ahụ, Guerrero gbara onye nke ise. Na ngwụcha oge, Guerrero gbara onye nke iri na isii n'ime ihe iri abụọ na anọ.