Hi guys. Having a problem with my new engine. Car idles fine and runs fine until I get up to 3 grand. When i mash on it and it gets to 3 grand it starts to bang and I dnt know the reason y. I changed the plugs and everything else on the engine is brand new. What cud b causing this problem? Thanks in advance guys!!!

 

banging is kinda vauge, hard to diagnose a noise without hearing it.......take a video if you can and post it of the issue

 

its probably built wrong...

 

Banging meaning back-firing? If so make sure spout conector is in.

 

no clue what youre talking about. +1 on the video