Help!!! Some one !

[02blacksvt]

Okay, i live in Cincinnati ohio i was driving up 75 to Dayton last night and i was in 6th gear at about 70mph at about 3k rpm.. okay well i was just minding my own buisness and then all of a sudden the rpms shot up and the speedometer did to and the car like started to bog and cut out alittle and then i down shifted to 5th and stayed there for a sceond and then i went back to 6th and everything was okay and then it did it the rest of the way to dayton off and on multipul times. and sometimes it would even do it in 5th and 4th and id have to go as low as 3rd gear and then go to 4th then 5th then 6th. i have no idea what this could be? i still have a good clutch so i dont think it is that. Ecm maybe? im really lost, if anyone has any suggestions or have had this problem before please help

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