Make sure you have the vacume lines hooked up to your map sensor, Just in case you don't know what or where the map sensor is, its behind the intake manfold on the firewall, more towards the throttle body. It has a couple vacume lines going to it. But that is only if its a 88-91, if its obd2 then you map is on top of your throttle body and has a 3 plug connector. -Ben