I recently had to drop a JDM B18B in my '94 integra. New engine only has between 35-40k mi. on it. it runs rough and the tach bounces. i've transplanted the USDM fuel rail, injectors, and distributor and i've taken it to a shop and had a relay replaced and they said it was fixed, but here i am 2 days later and it runs like crap and when i put the pedal down it chokes. someone please help.