I cant get these last couple gaps. I've read the walkthrough but none of them seem to work.
NAWLINS STREET MANUAL (New Orleans)- i always run out of speed while manualing
FLATLAND TECHIN (philly)- i think im doing it right, but it just wont register
FLATLAND TECHIN TO THE STREET (philly)- same thing.. wont register
OFF THE COUCH (airport)- like the nawlins manual.. cant get enough speed while manualing

Any help would be appreciated.