First time poster here. A while ago I had a old beater Chevrolet truck that I traded for my brothers old 91 Firebird. Got that running and listed it for sale or trade, someone offered me a 97 prelude with the f20b/lsd full swap. Said it didn’t run well and had a idle issue. Preferring Honda’s, I said whatever, I’m only 400 into the truck/bird. I am a body guy, but no mechanic. I do do the work myself and learn along the way. I said hey, I either get the prelude shell to do something with, the engine and tranny itself, or both together. 3 decent options of what to do.

Enough about me, the prelude threw a code for iacv/p1508 and one for the TPS. I bought a used plenum and TB from a yard with sensors to just swap and test. The tps code went away and never came back. The idle air control circuit code persists, it will idle surge at 1-1.5k rpm when the code is cleared and jumps way up to 4/5k when code and cel come up. I’ve done small tests, drain coolant, change the sensors (albeit used ones) and it made the car run a little better but still idles awfully. I did some vacuum tests to no solution. I’m wondering if I should persist and try to figure out this problem? My thoughts are going toward bad wiring or ECU. Any comments on what your thoughts could be would be great.

Im also thinking of using this engine and trans into another car, but don’t know what a good one for it would be. Let me know what you guys think. (This is not a daily or an urgent issue. Simply a side project for something to do and to build a car I just enjoy) I’ll be happy to give more info, I just don’t have much on the car itself, which is why I’m thinking the lude itself may be too far gone.