Help we're stuck in Mexico City

Old Yeller continues to deteriorate like a patient dying on the operating table. It seems the more we take apart to make her better, the worse she gets. There are glimmers of hope followed by choking sounds and plumes of smoke pouring from the exhaust pipe. The Bosch mechanics have checked almost every part of the engine over the last few days and Dan and Ben stayed up all night with Ismael putting the engine back together for one last time before testing it again this morning. It now doesn't seem to be firing on all cylinders which might indicate some catastrophic engine failure. Or something else? Who knows. All we know is that the car was at least running before we took it apart to repair the fuel pump and now its almost dead. Stranded and waiting in the garage on our third day here, we are now wondering what our options are. To buy a car in Mexico City will take us 4 days to process the paperwork. Other options are to drive a hire car to meet the other teams on the Pacific coast, cadge a lift to Guatemala and buy another car there. We don't have space in all the cars for all the people. So disastro hits Greaseball for the moment, but nothing we won't figure out hopefully. If anyone out there would like to help us get back on the road, we welcome your help!! Call us on + 44 7956 67 72 73