I got a new to me 1986 Long Bed 22R 5-Speed and in the first month of owning it, I've noticed a few issues. For starters it idles a little rough, you can really feel it when you shutoff the engine. Also I've noticed that at low RPMs it sputters/hesitates, especially in 1st and 2nd.

I've already replaced the plugs, plug harness, dist. cap and dist. rotor all with OE parts.

What should I be looking for? I have a bit of an exhaust leak right after the cat, but that wouldn't be causing the rough idle, would it?