have a stock 87 v6 in my 86 gt. seince i swaped it in it doesnt like to start. i have to crank it forever. now on top of it all it does not like to stay running untill it gets to about 150*. where do i start loking. could it be an ignition modual or some other sensor. injectors maybe. it does have a fresh tune up.(thought that was the problem). help please it is my daily driver
thanks
chris

First thing I would do is put a fuel pressure gauge on and see what the fuel is at. You need 40PSI for a good start.
Sound like you have spark but check the coil wire just to be sure.
You say it was a replacement 2.8. Was it used and did it set around for awhile? Injectors can gum up.
Do you have winaldl and a cable. good to have.
Your IAC could be stuck causing the problem but it would be hard to check without a cable or do the finger method.

My shade tree test for IAC's has been to pull the iac out, reconnect the plug, hold the iac in one hand with your finger(s) also holding the pintel so it does not shoot out of the iac motor. (don't want to loose the little bugger) Have someone start the car and place a finger of your other hand into the iac hole in the TB and simulate the iac to control your engine idle. You can vary the engine speed as you watch the iac drive in and out. (if it is working correctly)
If you can't do this and make it work you need to trouble shoot what the issue is. You could also log with winaldl while doing this and see what your iac counts are doing. Together doing this might get you somewhere.

Could try a shot of starter fluid and see if it start sooner, that could also be an indication of a fuel problem.