Hi first post here
so I just finished putting together my car, white 91 Si with 1st gen b16a stock just a refresh and new distributor components coil & icm. Swapped with the original Si harness and wired vtec to the ecu with the 5 wires like you should. Drove great for two weeks straight fixing things that pop up.

yesterday March 7 driving back from school the tach is jumping cutting in and out as I like hit a bump or put the winker on. Stop for some snacks and the car won’t start after and I hear relays clicking lik crazy. Jump the starter no work so I bump the car to get home. Get the starter rebuilt tday and key still doesn’t work, jump the starer nope , bump the car and let it warm up.

drive one pass down the block and the car is bucking like mad popping and spitting at half throttle, engine light faintly clicking on/off relays bugging out tach needle too. Like what the heck Mang give this old thing life and it spits in my face. Any advice would help kinda think it’s a relay prob but idk

 

Missing some grounds?