My daughter's camero stalls occasionally when you engage the clutch for stops when warm. I have recently tuned it to try to stop this and new air filter, fuel filter, plugs, wires. I just replaced the switch on the clutch. Probably not related but she just needed a new battery.

I've checked the vac lines, they look ok. The plugs read a little lean (white).

maybe needs a Mass Air sensor?

Welcome to the Club! Keeping my daughter's camero running keeps her happy. Isn't this the truth?

Tell us about the engine/trans combo.

A couple things come to mind - 1. Does it Fast idle when cold?
2. Does the engine idle up when A/C is selected?
3. Does the engine seem to idle really slow?

If the engine doesn't do the idle upspeed, its IAC (Idle Air Control), the little motor on the side of the throttle assembly with the four-wire connector, may not be working itself or not getting its command from the ECM.

The engine may also need to have a timing light connected to reset base timing. Somewhere, either on the engine side of firewall, or pass footwell, there will be an ignition system bypass to unplug to remove ECM advance so the base (initial) timing can be set. Read Emissions sticker in engine compartment for further instructions.

You can always unplug the battery for a couple of minutes to reset the ECM and try agian. Never hurts.

Hopefully, others here will submit their knowledge.