Some of these are gonna seem pretty basic. But everybody from the beginner to the seasoned engine-tuning veteran has probably been guilty of misdiagnosing a poor-running engine at some point in time.

Do you expect to unwrap new car parts, bolt 'em on in an afternoon, and go terrorize the streets that evening? If that's you, forget about converting your carbureted car to EFI. On the other hand, if ...