They call it the “spring swoon.” For the third straight year, the American economy bounded out of the starting blocks, adding hundreds of thousands of jobs in January and February. And for the third year in a row, that momentum melted away in the spring like the last traces of winter snow. Employers added only 88,000 jobs this March, the Labor Department announced on Friday, the worst monthly jobs report since June. Economists predicted gains of at least twice as much, and the news fed fears that the economy’s modest recovery might be faltering. And this before we’ve even felt the real effect of the “sequester,” those $85 billion across-the-board budget cuts recently approved by Congress and President Obama.