I had a B16 put in my car a year ago after my turbo D16 went out. The car has been running perfect until about 3weeks ago it started to stumble, the tach and engine would fluctuate wildly about + or -, a few hundred rpms. It finally died while I was driving down a bumpy road and wasn't getting spark, it ended up being the ignition coil. It still has the same problem though as if something is loose, before I put together that it was only stumbling when the car wasn't on perfectly smooth pavement, I changed the plugs, wires, cap rotor, fuel filter and some of the questionable vacuum lines. I reset the ecm, checked all the fuses, jiggled everything sensor I could think of to see if it was loose. Does anyone have any ideas on what I could check next?
Thanks

 

Someone suggested checking all the grounds, think I'll do that.