ive seen crank position sensors cause that and get so bad it has a hard time starting on those distributorless systems.

 

my buddy's 6.0 has bad knock sensors and his is doing that sometimes

 

the problem ended up being an O2 sensor

Thanks for the help

 

Who'da thunk it?

 

i have the same problem as mine is 94 it runs good then drops rpm to 500 stalls out almost i took the idle air control valve off it runs ok but with high idle at 2000
i am planing on replaceing that if that doesnt fix it what should i do next
i already have replaced the fuel filter
the coil and all the wires
so if the idle air control valve ont fix this problem then where should i go next