1994 Pontiac Bonneville

Well no vaccum leaks>

I have done all this thottle body is clean. EGR valve is working?It idles about 1500 Rpms and sometimes gets higher and sometimes goes down when it gets hotter but not much. I don' t know what esle to do?

The flap on the thottle body closes all the way.

No screws. Sometimes I start it and it idles up real fast.I can turn the car off and start it back up and it idles back down to normal. I just don't know what to do.

No, the idle usually keeps getting higher and higher. Even sometimes when I restart it. It doesn't go down. It might do good all day and then all at once start idling crazy. I think I'm going to set it on fire.

In addition to previous posters suggestions, double check and make sure that u purchased and installed the correct IAC for your specific model, year, etc. It's not likely that an incorrect IAC would have the same connections but I've seen it happen and the problem really sounds like your IAC. Also take a look @ your Mass Air Flow sensor. Usually a bad MAF would just cause the car to stall but a dirty one might cause it to freak out. Lastly, you may have a bad fuel pressure regulator. You can check it by attaching a fuel pressure gauge to the schrader valve on the fuel rail and turn the ignition w/o cranking the engine. Your psi should be about 40-43 psi. If it's higher it could be your FPR letting the fuel pump go nuts, hence the high idle.

I finally checked the TPS with my voltage meter And it was reading wild. It is supposed to read about.5 volts with the Throttle closed, it was reading 2 volts. I would move the throttle like giving it gas and the voltage would jump around everywhere. It has 5 volts coming to it and should have 5 volts going out with the throttle wide open. I just want everybody know just in case someone else had these same problems. Plus the transmission gears didn't change right. Thanks for all the Emails trying to help.