Ok here's the situation. I have a buddy who has a 93 honda prelude with a built h22 motor. sleeves, pistons, rods, valvetrain, headworks...etc..etc..anyways the car was previously turbo'd. We took out the turbo kit and now the car seems to have some kind of idling problem. When in cold start the car's idle shoots up to about 2-3k rpm and back down again. When the car kinda warms up it doesnt idle as bad but still idles. When he goes to drive the car when it's warmed up and slowly letting off the clutch and he give it a little gas between 1-2k rpm, the rpm just drops to around 800rpm and has that little bog. It's like the cars in limp mod and doesnt want to go anywhere. Anyone ever encountered this problem or know how to repair it. Would it be some faulty injectors, tps sensors, map sensors, iat sensors, iac sensors?

any inputs would be great.