heres whats going on....i start the car up and it idles high at 3k rpm for like 5-6 seconds and drops to around 750. once i hit the throttle it idles back to 3k. and its steady. it does this over and over. the only check engine code i get is code 6 but i done replaced the ECT. the engine is the B20A 1988 year.

 

it was iacv vacuum line. lol simple enough i guess.