Fiero starts, dies, then starts and work!

That's a weird one!

I had something like this with a GMC Jimmy, it turned out to be air getting into the fuel lines. It would start, run rough, then clear when the air got out of the lines.

The way the air got into the system was that the injectors were leaking, dumping fuel into the manifold to be replaced by air into the feed lines (Long individual feeds on the Jimmy which made it way more prevalent compared with the Fiero 'fuel rail', but could still happen if the leakage was excessive).

The 2.8 starts in kind of a funny way. It uses a 'cold start injector'. This means the fuel aspect get muddied a bit.

With a stock 2.8, there might be enough fuel in the start injector to initially start, but the injectors may not have fuel for a short interval thereafter which causes the engine to die. Then, the air clears through the fuel pressure reg and you're solid the rest of the time.

Or, it could be the rpm signal to the ecm is intermittent (which will shut doen the fuel pump), but I'd expect that you would have problems while on the road with that.

Chay