Car hiccup when giving it gas, what is the worst case scenario?

I have a 98 honda civic that just died on me and needed the spark replaced 2 weeks ago. Yesterday and this morning, it started having a hiccup every time I give it gas, like if i accelerating to pass a car, or going off a stop sign… It's gotten worse this morning compared to yesterday afternoon. The engine sounds normal, no lights come up… How fast should I get it checked? And how serious does this sound?

High tension leads going bad or coil packs. Could also be induction manifold/air cleaner hoses split or misplaced.

Hi it sounds like spark plugs you bought where rubbish to me.

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