1989 Pontiac Firebird Car won't start when at running tempe

No the car runs okay until you shut it off. Then you can't start it with out starting fluid. Once you get it started with starting fluid it runs really poor. If you let it cool completely down then it will start and run good.

Does the temp guage and engine coolant sensor use the same sensor? The temp guage works fine.

Well I have some up dates. There seems to be 2 coolant temp sensors. One in the front of the engine and one on the right cyclinder head. The one in the front measured 3500 ohms cold and when we brought the car to operating temp it measured 345 ohms. This seems to be okay. The sensor on the cyclinder head cold measured 1 megohms and at temp measured 4 megohms. This seemed high to us so we replaced it with a 7000 ohm resistor to see if it would start. No go still no fuel. It will start with starting fluid and run poorly. We also checked the oxygen sensor cold.2v hot.7v seems okay. Also checked the Mass air flow
by applying power and blowing across it. Signal
went from.05V to.072V so we could see a change.
The IAT power open circuit measured 5V and in circuit went to.9V. We have already changed the computer.
We are out of ideas ! !

Do you know where the Cam sensor is located? I don't think the 5.0L 89 Firebird has a crank sensor. There isn't one in the front of the engine. Where else would it be?

Thanks, We will keep fighting it.

Well we finally got this fixed. We replaced the temp coolant sensor with a 3500 ohm resistor making the computer stay in open loop mode and we still had the problem. So we started to look for things that fail at temp that the computer doesn't have diagnostics for. It turned out to be the fuel injectors themselves. This is a known problem with Rochester Multec fuel injectors in GM cars in the late 80's and early 90's. At temp the coil
impedence on some injectors would get as low as 1.5 ohms. Should be around 12 ohms and no less than 10 ohms. Tough problem since cold the injector impedence measured okay and most injector impedences fail by increased impedence. I hope this is helpful to someone else. We put a new set of injectors in and the car runs fine.