For 1991, Danny Sullivan took over as primary driver (also another former Penske driver), and the team continued to fail miserably. Guerrero stayed on as a second driver for the Indy 500 and selected other races. That year, Guerrero would be involved in a controversial crash at Indianapolis with Kevin Cogan. By the end of the 1991 CART season, Patrick was in financial and legal trouble. Rumors surfaced that the Patrick team had shipped one of the Ilmor Chevrolet V-8 engines over to the Alfa-Romeo engine developers in Italy, who in turn, tore the engine down to examine it and allegedly stole design ideas. It was returned in pieces and infuriated Ilmor officials.