engine rattle on acceleration-help

[paul cass]

hey everyone
i'm having a problem with my daughter's fuel injected throttle body 302. while its not in a cobra i need some help. the engine is in an 88 full size ford bronco. the engine has been rebuilt and has all new parts including computer, injectors, sensors, distributor, coil, etc. she has had different mechanics work on it and still there is a problem. under any kind of acceleration the engine makes a terrible clattering noise. i've reduced the timing to '0' and it will run ok around town for short jaunts. once on the road after 30 or so miles then it starts with the chatter under load. even going to 93 octane doesn't seem to help that much. if the timing is set at around 10 degrees the engine will not accelerate without clattering. what is going on. the engine worked fine before the rebuild. but since it had over 225,000 miles i thought it best to rebuild. now i am frustrated with the results. help!!
thanks,
paul