I've been running regular unleaded in it. I have heard that you should use premium but it is not stated anywhere on the car so i didn't know if this was merely an opinion. It has racing wires on it i can't remember the brand. I replaced spark plugs and wires maybe 6months ago or so. Do you think they could be bad already? The car runs and drives fine and even excellerates normally on the streets when you don't boost. But when i punch it to pass or enter highway and boost gage kicks up one or two squares the car kind of chugs until i let off gas. I've heard of many different things that this could be but unsure! Any help would be awesome!
