Salam,
First of all, the 1.6 SE SALOON is at par with the VTEC in all aspects. The vtec stuff are just marketting gimicks, if someone is very proud to own a vtec then he shoul dcee the VVTi , VVTi II and VVTi III engines which came a long time ago but these things don't make muck difference. The SE SALOON just consumes more fuel than the Vti and that's all.
now coming to the forum's topic, the same problem occurred with a friend of mine who bought a Baleno. It came out that there was something clogging the air intake to the engine. They put that stuff while setting the RPM and they forgot to take it out. When it was removed , the car was gliding rather than running. So I suggest that you go to a mechanic and ask him to perform a complete checkup of the engine especially the air intake.........................................................................