Check you vacuum lines first, theres a thread here somewhere showing you all the vacuum line locations. Then you want to check the timing. After that check your TPS to make sure it's still operational and sitting in the right position. Check the TPS screw as well and make sure it's not twisted up too high. Lastly check your ISCV. Just pinch it a bit see if it brings down the engine rpm a bit. Doesn't mean it's the ISCV, it's just to see how the engine reacts.
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