Im putting this post up for a friend of mine. He ust recently bought a 93 integra with a lsvtec. it has a pr3-4 head, and a pr4 ecu. I assume it has a GSR intake manifold. no clue? anyways, its idle is jumping up and down from 1k to 2.5k. I personally think its a vacuum leak. what i wanted to ask was,does any one have a Vacuum diagram for his setup. I know theres not one originally made, but does anyone have a modified diagram for this engine in this car. He also said that he tried bleeding the coolant system, but from what he noticed that couldnt of been the problem cuz coolant was coming out with out air bubbles. let me knwo what you guys think? my other guesses on what the problem coul be are: IACV, FITV.