Are you still clicking on the locked link in general or wherever to get to this thing? I moved this to the 4G63 section since, for all we know, you're talking about a 4G63.
Like deej said, this site is about 2GNT DSMs, but we have a section for talking about the turbo cars. Experience tells us that a stock 420A running more than 7-10psi with the HRC S16G will result in you blowing your engine sooner or later. There is no way you could be running 17psi on stock internals with a 420A.
On top of that, you made a post talking about having a 1.8L 1994 2G. The 1.8L is a 4G63 derivative found only in the earliest of 1G DSMs. Basically, we don't know what car you're talking about when you're asking your questions, and when you post about a misfire at 17psi in the general section of a non-turbo forum, it sends up all kinds of red flags.
Know what I mean? Tell us the year and model of car you're experiencing this problem with and you will find you get more help than bullshit, okay?