just dies?!

my 89 cherokee starts fine and runs fine till i slow down and then accelerate for the first time since the i start it, it just dies...i did have some preoblem with the idle and the tps a few weeks ago could this be causes the problem if so how could i fix this.....kinda embrassing when pullin out of scholl and ur car just dies everytime

89 cherokee
4.0L Inline six

when you said you had problems with the IAC and the TPS did they get changed?

The tps was changed but i just adjusted the idle screw on the throttle body to raise up the rpms at idle.