My Car has a case of the sputters i need help

[bbejj123]

I hope this is the right section if not please move to section u feel it should be placed under...

Ok starting off my car has had an abnormally high idle at around 1500rpms
so i took a look at the fsm and tried what it told me to do to fix that problem i check the ecu mode#3 threw code 55 (no malfunction) so i
continue i disconnected the throttle sensor and adjust the idle screw it lowers to about 1100rpms then plug back in throttle sensor still quite high so i retard the timing until it idles at around 550-600 then i take it for a drive around the block timing is way to retarded lags like a mother...so i advance the timing to where the throttle feels right and i still get the power i had before (lack of a working timing light) so i drive it the rest of the day no problem the next day i take my my car out of the driveway and i push the clutch down to start it then as i release the clutch to backup the clutch engages super early i get it on the street pull the pedal with my foot then it works fine while i was backing up it was sputtering every time i tap on the gas.

Im wondering if anyone has had the same problem or knows what might be wrong... any comments concerns or whatever your input is welcome