hola. ive kinda narrowed down what it could be. when i start my car and warm it up. it will drop the revs to about 500rpm. when that happens. i hear this weird clunking/clattering noise from my engine. i suspect its probibly the engine mounts,obviously caus my babys about 22 yrs old. but just open to other suggestions on what it could be. someone told me that it might be a vacuum leak.. but i kinda just laughed cause it doesnt sound like that kind of problem to me.. unno..

 

lol vac leaks do cause low idle

just replace all of your 22 year old vac hoses with silicone and go from there.

to adjust the idle turn the screw on top of the throttle body until it hits 750 rpm. then adjust the pressure sensor, right in front of the shock left side if your facing the engine, to the highest then re-adjust the screw on top of the tb to 750.