1989 Jeep Wrangler 2.5 tbi?

I have a 89 jeep wrangler with a straight four. It feels it very underpowered. To get to Walmart I have to go up a 6% grade. If I floor it while going up It just goes the same speed. Is this normal? It has an intake, exhaust and a test pipe. I know it can put more parts in it but I just wanna know if anybody else experience this.

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