Rough Idle and Electrical Problems.. HELP!

[TS87FC3S]

So I checked the ground at the starter and yes it was off so I hooked it up but prior to this I had already added extra ground straps, It seems that hot idle has gotten better but when I pull up to a stoplight it still dies or tries to die. And I lose all power at 6k and after driving hard today the clutch seems fine it feels more like in losing spark because as soon as I let off throttle it backfires like alot of fuel in exhaust.. I checked all sensors and all check out except the tps resistance is high but it is corroded so I'm gonna clean it and recheck it...