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Check Engine Light on? If so, check the code(s). Limp mode should mean CEL somewhere.
What is the ECU numbers? B18B1 is a P75-Axx but who knows what you have.
Basic sensors hooked up? (O2, TPS, MAP, etc.)
Engine harness should be unmolested but how does it look?
Your D15 non VTEC harness is perfect to use with the B18B1 swap. You might need to extend the O2 wiring (I did with a D16Z6 harness and a B16Aswap). But it will work just fine.could be i have a 95 with a d15 non vtec 5 speed also should i steal wiring harness from it and hook it up with the b18b1 ecu but still whats the thing on top of my intake manifold?