Signature 600 chuffing

[Creek]

Pulled the boot. No popping sound. Can hear a chugging when the air compressor cuts in. That and the miss is still audible. So to me, that is good news.
Still debating the investment for insite. I probably will. I have a cheap HP laptop. Very slow most of the time. Does one need a loaded up laptop to run insite?
Where is the best place to purchase what I need? Thanks a bunch.