why does car only run for a few seconds?

I have a 1991 toyota levin (4A-GE silver top). I just fixed a water leak and to do so I have to take the inlet plenum off. I put it all back together and now the car starts and runs for a few seconds the shuts off. Stupidly I did the work with the battery connected so perhaps I shorted something... Im stuck. I did take the fuel lines off... maybe i didnt put the on correctly...