Orion problems

Hello everyone out there I also have an Orion 1.6i Ghia of 88 and lately it has me crazy and I do not make a career with the starts and when walking pulls and I have stopped. I have changed the pill of the ignition, cover of the of the ofco, spark plugs, air and gasoline filter, even the gasoline pump a whole grass and it makes me sad I could lend a hand. Today the uncle has no longer wanted to start, it starts and stops it is as if the injection was cut. Thank you.