today i was driving and i stopped at a red light and noticed that my idle was at 950rpm so when i got home and put it in park the idle went to around 1250-1300 rpm, i thinh it should idle at 750-800 rpm when it is warm i looked for a vacuume leak and all of my lines are hooked up and dont seem to be damaged i dont think it is the tps or the iac ,when i unhook them the idle jumps to around 2000-2200 rpm plug them in and it goes down to 1600 then slowly down to 1250 but wont return to 750 like it use to , any ideas would help before i start buying parts i dont need