Ive just installed a built b20vtec into my civic si (2000) im using the standard injectors at the mo just to get it running. its not tuned i just wanted to start the motor to see if it ran ok, no driving just letting it tick over.

I start it and straight away it idles at 2000rpm exactly, they after 2,3 mins rises to like 2200rpm, then bout min later drop quiclkly to 1000rpm then shoots to 2000rpm then drops again, all happens really quicky. Its running on the standard ecu. Ive checked all the vaccum lines i can see. any idea???

Thanks
James

 

Could it be the timings off???