If it was running before you did a tune up, then the problem lies within what you did during that tune up.
The most likely issue is that you have the spark plugs on the wrong towers of the distributor cap. A secondary possibility is that the distributor has been stabbed a tooth off and so the wires were just moved around the cap to compensate.
Do not look deeper than where the problem lies, you have a high potential to make it worse. Look at the work you did an figure out where something went wrong.
The most likely issue is that you have the spark plugs on the wrong towers of the distributor cap. A secondary possibility is that the distributor has been stabbed a tooth off and so the wires were just moved around the cap to compensate.
Do not look deeper than where the problem lies, you have a high potential to make it worse. Look at the work you did an figure out where something went wrong.