Could be several reasons but the first one that comes to mind is a very plugged up fuel filter, the second reason would be fuel pump failure.
What causes a car to idle good and run rough when you give it gas?
Because the engine is running. Shut it off or give it gas and it will not idle.
adjust the Idle screw... im not sure where it is on the 1991 model but it exists...
What causes back firing on a ford explorer and it to idle rough and want to cut out when you try to give it gas.
turn it on in idle till it dies?
It could be the idle control P1507
You have to change the mass flow sensor
what would cause a knockings noise in my boat 3560- 2004 transmission when in idle goes away when you give it gas
I just bought a 79 Chevy with the 5.7 350 in it..it was doing the same thing next time you put gas in it get some sort of additive like carb cleaner and put it in the gas then try and blow it out a little I drove mine about 100 miles when I bought it and it seems to be just fine now
idle control valve
Check the throttle position sensor
it chokes and dies duuhh