rough idle??

[turbod]

hey everyone........i just got my car back from the mechanic who installed a new computer in it for me. now when he did this he took out my hi-performance chip and put the stock one back in!! when i start the car cold, it surges to 2200 rpm's then it drops to 1000 or 1200 then it goes up and down and spits and sputters. someone suggested i replace the chip with another good name chip with some new injectors!! when i replace the injectors should i also replace the fuel injection wire harness as well?? does anyone know where i can get a good set of injectors and a chip as a package deal? car has 74,000 on it and is all stock except the k=n air filter, chip and injectors. do i need to also look at the tps sensor, iac valve {motor} has new plugs and wires. i was told the camshafts in these cars suck anyhow and they wear really fast?? does anyone else have bad idle problems??? thanks everyone!!!!