I bought a 98 blazer to fix up and sell. It has 114k on it. It has a rough idle. I narrowed it down to cylinder 6 since the idle doesn't change when pulling of the plug wire. It has spark and the plug is fine. Im assuming it is an injector but is there anything else that would cause the rough idle? What is involved in replacing an injector? Its a vortec motor, vin "W". I really dont want to have to put a lot of time and money into this since im already putting a transmission in it.