Hesitation and sluggish

That oil leak under the distributor is shorting out the distributor. Happens all the time on these cars. You will have to replace the distributor and coil and you should be good to go.

Here is a decent how-to video that I found for you: https://www.youtube.com/watch?v=G-qLBAXqGfo

It is a job that anyone can do, as long as you have a basic socket set (maybe $40.00 at sears) and a Philips head screwdriver.

Good luck.

The sparks are being shorted out by that oil leak. It is common on those cars. Fix the leak by replacing the distributor and the seal (at the least). I suggest replacing the coil as well.

The new distributor will come with it.

Hmmmm is the service engine light coming on? If so, yo should get it scanned and see what comes up. AutoZone, Advance Auto, and O'Reilly Auto all have a scanner and will scan your car for free.

If the light isn't on, then maybe we should check and see if the catalytic converter is clogged. If so, it would be creating too much back pressure through the exhaust, not allowing the engine to breathe properly, which often creates hesitation and bogging down.

Here's a how-to guide on checking the cat: https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

The process I've always used is somewhat simplified. Basically, I just take the oxygen sensor that is between the engine and the catalytic converter out, and take teh car for a drive. This helps reduce back pressure that a clogged cat would create. If it feels better, then the cat needs to be replaced. If not, then put the sensor back on and we'll move on to checking other things, like fuel pressure.

So does that mean that you did the cat check? Because if not, even if you don't have the money for a new one, you should still check into it. As for the transmission drain plug, personally I'd just go to the dealer and get one from them, instead of using a "universal" thing. It probably won't cost any more than what you're looking at, and you don't have to wait for shipping. I always like to get OE parts when possible, because they just fit better and are generally better quality.