I was driving my explorer the other day and it just puttered up on me and quit. I restarted and it eventualy started, but didn’t run very well. It now will not even start. It cranks fine, just doesn’t start.

I checked for spark, and I got that. Pulled the carb after cranking it and there was fuel after the carb into the engine. I can get it to fire on starting fluid.

Any ideas on what I got going on?
Is my engine bad?
What else can I check?