Matt O.

No love on the 924/944/968 board. Figured here would be better...

After acceleration or revving the engine, then releasing the throttle, the rpms drop and the engine quits.

So what's the first, second, and third things to look for?

Rogue_Ant

First, make sure your idle speed is adjusted properly.

Idle Speed Adjustment

TPS second. Make sure the idle circuit is working properly.

TPS testing

Third, boost/vacuum leaks. Make a tester:

Intake leak tester