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i just swapped a 99 b16a2 into a 97 ex i used the stock ex harness the car runs good intill the vtec kicks in, when the vtec kicks in my rpms start jumping all over the place recentl the check engine light came on for fuel trim p0170 and p0172 running rich i just want to fix the rpm from...

this is my first post on this forum but i have looked around anyhow i have a 97 civic ex that i just dropped in a 00 si motor (b16a2) i have no check engine light or anything runs good untill i hit vtec once in vtec both my stock and aftermarket tach start going crazy and my car studers any...