I have 136,000 miles on this car with an idle that continues to drop below 750rpm in gear and starts the car shaking. I can't seem to adjust it up high enough. I have replaced the following over the past year: iacv, vacuum advance, rotor, cap, plugs, wires, 4 fuel injectors, both coolant temperature sensors on top of thermostat housing and thermostat. I have tried unplugging the iacv then the ecu fuse and reattaching. That seems to help for awhile then it goes back to a low idle. I have looked over all of the vacuum lines and can't seem to find a leak. This is a great car that is in unbelievable Florida condition. But it is also driving me crazy. Please help!

 

Have you cleaned the tb? Both sides of the butterfly and the edge where it seats off?

There is an idle adjustment you can do but I would want to wait

 

I have not. I will give that a try and let you know how it works out. Thank you for your help.

 

Well I cleaned the throttle body yesterday but it didn't make a difference. It was very dirty. It seats and closes just fine. Next?

 

One thing more, reset the ecu by pulling the fuse.

Then, if the low idle is there, use the the idle screw to get it to spec....yes you might ask why that was not the first answer, well IMO adjusting the idle screw is the "last" thing you should do to "solve" a base idle issue.