Replaced sensors, leak tested, tuned up.

The mechanic is saying it might be the computer. He is not sure so I have to pay another 200 for a solution that might not work.

When I have my foot on the brake while I am giving it gas is my definition of powerbraking. Not to much gas that I am spinning the tires but enough to keep it from stalling. I put the car in neutral when I come to a stop and it idles fine. I put my foot on the brake and put it in drive and give it some gas to keep it from stalling. Sometimes I am to slow and it stalls through the turn.

305 TBI

I have a V8 305 TBI.

Hi,
I have the same promblem like yours on my '92 RS Camaro, 2 years ago I replaced my old engine(260'000) whit a new one, new TBI unit, replaced all the sensors, fuel pump, IAC, EGR, distributor and spark plug wires too.
The first 3 months it runs like a missile, now it stall at idle speed.
Perhaps it is an ECM or Eprom problem, the ECM wires I have tested are ok, anyway the problem persist.
Still reaching the problem.

Have you checked the mass air flow sensor?

Yes, I have interchanged the MAP with my other car ('89 Firebird 305 TBI), the last week I have also interchanged the ECM unit and Eprom from Firebird to Camaro, now the Camaro engine run little"fresh", good power wen I put the gas but. Still stall on idle!
In drive and in reverse.
Note:when I have interchanged those ECM, on Camaro, I have just made a "reset" to mechanical idle and the same I made on the IAC, I also added a new Throttle Position Sensor.
Now, under my Camaro I have a new coil ready to try, perhaps on the next week-end I'll do it.

I forgot. Sorry if my English language is a little"imperfect"!

Mass air flow sensor is not the MAP (Manifold Absolute Pressure) sensor.

Right, I make a mistake!
But, the mass air flow sensor is on the TPI injection system, not on TBI, or what?

OK My bad, you are correct.

On the next days I redo a sensor-ground test, an ECM wires control, ESC Volt and vacuum test and last, wen I found a fuel pressure meter on ebay, I test that pressure(fuel pump in fuel tank changed two times after that problem. New fuel filter added too.)
Don't leave me now:-/