How do you adjust the idle on a fuel injected 89 Pontiac Sunbird?

If your engine is ideling fast its probably temperature senser. There is no adjustment for idle.

that last answer is not entirely true. u can adjust the idle. but it depends on if its a throttle body unit that looks like a carburetor or a smaller unit. on a TBI unit, there is a screw u can adjust but the only way to adjust it is with the right tool. its not a Philips screw or straight blade. but if its idling high or fast it might be the idle air control valve. the one went out on my 1985 sunbird and caused it to idle funny.