My 1990 Ford Mustang when driving sputters and stalls nothing shows on diagnostics machine

Can you duplicate the problem at home ? You would need to figure out if it is lack of fuel or spark to proceed with testing.

This is all you need to know. It is arranged in order of the most likely failures
first. http://www.stangnet.com/mustang-forums/threads/mustang-cuts-out-and-dies-after-warm-up.827901/

Ford OBD Diagnostic Trouble Codes

Plugs and wires are a good start, if they haven't been replaced for a while. I would change the fuel filter and check the air filter. The fuel filter is often overlooked. The ones I change, you wouldn't believe the dirt that's in them.

Are you getting a check engine light?

check whith scanner for codes,it coul be missfire,it need to be diagnostic

It sounds as if you have a fuel system problem or either the exhaust may be stopped up. Have the fuel pressure checked it should be at or near 30-35 lbs if not you may need to replace the fuel pressure regulator or the fuel pump. Both are common on parts to fail.

Replace the fuel filter.

your transmission is toasted, replace it.

that'll b air intake system or not enough gas going 2 the engine so it stalls or blocked gas lines