94 4.3L vin w intermittent start stop high revs or runs great
 

the history is 1yr ago it started acting up wont start or hard start also at any steady speed(cruise on and off) it would rev very high 5 to 6k my guess as no tach. it would do this at a complete stop also!!!good thing brakes are good. anyway i amm usually alone when i drive but 1 time i had a friend check for spark as i cranked and yes good spark so to make this short since then i have replaced:fuel filter, fuel pump,spyder assy(new),O2 sensor(what a bitch),a tps or close(small 1 mounted on top/side phelum)and a waste of money on a new dist assy i did all the work myself so know it was done right. any help?