My 94 gmc has been dying on a cold start and idling funny here recently

It has the 5.0 tbi

Idle Air Control Sensor, looking at the front of the motor, it is on the left side corner of the TBI. I would take the TBI off and take that sensor out and clean that port out good along with the hole TBI. I have also seen the base gasket be bad for the TBI. I would put in a new sensor, since that port is a major source of vacuum. Check and snug up the bolts for the intake manifold also.

Ok sweet thnx for the knowledge

Note it only idles jump for bout 5mn after that it's smooth as always

That is just a start, if what I suggested doesn't fix your problem the next thing to check would be the fuel pressure. There may be a bad fuel pump or a weak fuel regulator in the TBI.

Cleaning and the IAC then...Check intake bolts.

Ok I also put a new fuel pump in bout a year ago then come to find out it was a fuse lbs