I HAVE A 1990 GT. I HAVE REPLACED THE STARTER , STARTER SILINOID ON THE FENDERWELL, AND BATTERY. ITS STILL DOING THE SAME THING. IF YOU PUSH IN THE CLUTCH AND TURN THE KEY AT FIRST IT WONT START. IF YOU LET OUT THE CLUTCH PUSH IT BACK IN AND THEN TURN THE KEY IT WILL START. SOMETIMES IT TAKES THREE OR FOUR TIMES. IF I START THE CAR BACK TO BACK THE CAR STARTS REALLY WEAK. AND SOMETIMES I HAVE TO LET IT SIT A WHILE BECAUSE IT DOSENT HAVE THE POWER TO TURN OVER THE 302. I HAVE STOCK IGNITION, PLEASE HELP.

OK, sounds like it could be a couple things, mainly two tho... If you mean you have to re-adjust how you push the clutch in, or the clutch is the key to finally getting it to start, then it sounds like the Neutral Saftey Switch, or Clutch Saftey Switch. What this does is not allow the igniton to reach the starter if the Clutch is not fully engaged, so as you do not roll the car as you turn the key.
The other thing, and more likely the problem is the Igniton switch. Not the Igniton lock cylinder where you put the key in but the switch behind it, the lock cyl, turns a rod that activates a switch and starts the car, It is one unit when you buy one, on one end you have the switch that rests against the lock cyl, and 5-10 wires that travels down the steering column to the other end which is almost always a half-moon shaped harness where other wires plug in. Older models its fairly easy to change. Most its easy change, one thing you should need to rent is a steering wheel puller, and then you can access the lock cylinder release button. from there its usually a matter of bolt/screws 8mm? For more specific, let us know if you need help, or check a Chilton/Haynes manual.
Hope this helps..
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Not sure if i mentioned it, but I think its the Igniton switch not the saftey switch...
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THANKS ILL HAVE THAT CHECKED OUT.

YHIS WOULD ALSO MAKE THE CAR START WEAK ON THE SECOND,THIRD SO ON SO ON. THANKS

Yes, its possible. On fords, like i said, they use a push-rod style to activate the switch where as chryslers and gm's use a rotating switch that connects directly to the lock cyl. Anyway, over time the contact points for the rod can wear or the rod itself can bend, only allowing for about 1/2-1/3 turn that it use to, hense, myght barlely activate the igniton.
....Did i use the word hense? Ive been hanging around the british man too much.
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If the fix above doesn't work, then check your fuel pump. I can almost bet if the above fixes don't work, replacing your fuel pump will fix your problem.

[EricD]

My car would do something like this. It is the nutral safty switch i think. I would push the clutch in to start it and nothing. Thought it was dead. I would open the door and try it again an it would start. I have a friend with a 3.8 Supercoupe t- bird. Just resently his started the same thing. He would get in and nothing on the key. Open the door and try it again and lights camra action. All the candles lit. Funny ford thing maybe.

[Vortex]

check and see if you can pop start it. have people push you, push in the clutch, put it in 1st gear turn the key to on and when you get to about 5mph drop the clutch and it should kick itself over. usually a car will still start like this if its the clutch saftey, if its ignition switch usually not.
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[GT50]

I have gone over all of the replys so far and all are very good places to check. I noticed though that you mentioned that the car turns over very weak on the second and third attempt. My I suggest that you have the battery and charging system checked to make sure everything in that department is up to snuff.