Engine installed after 1 yr, wiring done to start the eninge. When I crank the starter engine rotates with starting gear but doesnot fire up. I put the inline spark plug tester 1 at a time and saw the light come up in every spark plug. What does that prove, does it prove distributor is functioning and the spark plugs are also good or spark plugs could be a problem also. I have put the gas tank and I have gas coming up to inline filter close to caruberator. I put some gas from the top of carburetor. it wont fire up some time some back fire and some smoke from exhaust manifold. Is this electical problem or carburetor need a rebuild. It was sitting for exactly one year before that it was deinately running.

Need help and inputs.

Thanks
Ganesh