Idle bad when moving

[Z32Matt]

I just got bought a 93' 300zx N/A with exhaust/ intake its got 132,000 miles

Whenever im driving and drop the rpms while moving by pressing the clutch in all the way or switching to neutral, The car will idle weird, only happens sometimes more when i step on the gas a little more then usual and then drop the rpms. But the rpms will jump around between 0-1200.. It actually will turn off at any speed could be 10 mph could be 50mph, its kinda scary when your steering locks up.. It doesnt happen when the car is stoped.

Any suggestions welcome - Thanks.

[Milton'Z Nissan'Z]

Run ECU diagnostics first to check if anything obvious shows up including doing the 02 sensor test

http://www.ttzd.com/tech/diagnostictech.html

The second thing to do is check the connectors with the spring clip are clean and not corroded which is very common and can wreak havoc. Test the injectors when those connectors are off to ensure they are working and in spec. Lastly test the AAC valve to see if it is working and properly set the base idle.

This is a good place to start, but I'd also do a compression test, check the condition and type of spark plugs, vacuum leak test, fuel pump pressure test. The best spark plug to use are the factory Nissan NGK plugs on this engine.
As with any fuel injected engine, there's lots that can go wrong but the first 3 are the most common for your description.

[evildky]

kinda sounds liek the aivc issue, combined with maybe a inpropperly adjusted tps or maybe even a poorly adjusted or even gunked up tb