BAD hesitation 2

well i already made a new thread a few days ago on a pretty bad hesitation problem and still not sure what it is, i talked to a friend of mine and he said maybe it was my transmission, well when it hesitates for a few secounds it then kicks real hard like the tranny went off and then caught back. well today on my way home from school my truck stalled at the light, worst part is is that its an automatic. it idles at 600 rpms like every other car iv driven. i was thinkin maybe it outta time? but i jus replaced the cap/rotor, all new spark plugs, all new time chain and gears, new ignition module, new distributor also. i have a 90 c1500 with a 350 tbi in it, and i have no clue to what the problem is.

Also, check the injectors and see if they are producing a fine mist or just squirting fuel. If they are just squirting, the engine will have trouble burning the fuel, and they need to be replaced.