The engine itself would be unharmed but an EMP is going to damage most electronics and most of the modern cars have electronic controls through out. The steering on mine is even electrical assist!!! Any electromagnetic tape would be damaged or the data on it would be erased so your credit cards etc. would be worthless. Hard drives are generally electromagnetic so even if the electronics of your computer made it the data would most likely be destroyed. CD's would be safe but the player would probably be damaged. In short a sizable EMP would bring most of our technology to a screeching halt. The positve is that an EMP is quite localized and it would require a very large EMP to cover very much area. If it is due to a nuclear blast the EMP would be the least to worry about.