im lost,plz help

my 92 z34 lumina with a 3.4 dohc only starts when it wants to.
it fires upfine one time,shut it ,and wont start again until it feels like it,i have spark,fuel pressure 50lbs,power to injectors,change the icm,knock sensor,crank sensor,tested the TPS and MAP sensor,IAC all tested fine on the hand held computer, i have no idea what is going on.how do you test the ECM TO TELL IF ITS FU**ED,any ideas?
i need some major help,if you could plz let me know what you think my problem is

thanks :runaround:

I f you have strong spark, and fuel pressure, than check for injector pulse, or try spraying carb cleaner into the intake see if it pops.

I f you have strong spark, and fuel pressure, than check for injector pulse, or try spraying carb cleaner into the intake see if it pops.
ok,but before i go back to the shop,i have another question.
can it be that the timing is out?i f it is out it shouldnt start at all,right?
becuase when it does start,it runs great,also what if the spark plug wires are in the wrong spots,again it shouldnt start right?

thanx again

If the plugs were an issue or the timing , it would not run " great".

Unplug the 6 wire connector from the ICM & see if the vehicle starts, if it does, the ICM is fine. Problem in ECM.

what and how is injector pulse?and is there any way to test ecm?
:banghead:

Based on the tone of your questions I might suggest some local professional help.

Based on the tone of your questions I might suggest some local professional help.
my tone?what?like im being an a$$hole or what?if thats the case,i didn't mean to be rude or anything.i was just asking a question.sorry if i offended you people.i just thought this forum was for people like you and i,and everyone else that has a question.so if my question offended you,than maybe you need professional help

once again.sorry guys