Car idles real low an it sound like the car is missing at idle. replaced rotor and plugs and wires

You may need a tune up- new plugs, filters, distributor cap and rotor, oil and filter. If your plug wires are brittle, cracked, or real, real old they should be replaced.
But before spending money, you might want a compression test to check the internal mechanical condition. Low compression in a cylinder from a burnt valve, or poorly seating valves, could cause rough idling and missing. That would have to be fixed first. You can buy a compression gauge for about $30 and do it yourself. Look on youtube or google for the correct procedure. It is really easy, and can help you decide if the engine needs repairs first, or if you can proceed with a tune up.
If you still have the rough idle, it could be in the carburetor. If your engine is worthy, consider a weber carburetor- lots of people with those engines use the weber 32-36. Better performance and economy than the stock carburetors, and they are sold with the adapter plate, gaskets, everything you need to install it on your intake. Kind of expensive, though. Last time I checked, they ran about $250. for new.

Replace plugs and wires.

check your fuel pump pressure, sounds like fuel pump pressure low

Sounds like it might be choke? Maybe a vacuum line leaking around the throttle body? Or oxygen sensor? Or throttle position sensor? Or mapp sensor?

Not positive, but I would try those in that order. I hope this helps.

This sounds like a vacuum leak or a timing issue.

change plug and wire if its been a while most cars have 90000 miles platinum plugs in them.but the wires wear before plugs.so change plugs and wires.+clean fuel injectors .change fuel filter and air filter.if car still run rough your idling to low.have idling check .

check plugs cap coil air filter too.

try the plug and wire
then try the cap and rotor

Pin point the dead hole and check that injector.

is the idle set at the correct rpms when idling.also check for a vacume leak.hope this helps thanks jeff