Need a little more info. Is the boggy feeling only in 1st gear?? Whats the mileage? When was the last tune-up done? Do you have an aftermarket can w/a power commander. Shooting in the dark here...could be a fuel delivery issue (sync throttle bodies) or some type of air restriction (air filter dirty) or maybe your clutch is slipping a bit. An extreme example would be a loose chain or maybe a sprocket missing a tooth or two.