sounds like maybe spark plugs or wires. But what do you mean by 1.5? Are you running a boost gauge in bars, or are you just trying to judge of the stock boost guage which is worthless

If your running 1.5 in bars then i hope you know thats about 22psi. Im not sure what your mods are but that might be too high. You may be hitting fuel cut

 

I know that 1.5 bars iis 22psi. I believe my gauge is bars, although it says kg/cm2, its useless nevertheless. And say I am hitting fuel cut how do I fix that? And its weird cuz it didn't do it before. So for starters imma chage plugs and wires, and see what happens. And yeah it was running 20 psi before when I got the car and it ran fine, and smooth. If its not plug and wires could it be that I have to tune my afc? Cuz as of now im running rich as a ****

 

i just changed the plugs and wires, and that wasn't it. it's weird, cuz if i build boost slowly it won't bog, but if i floor it it'll bog out at 4500(as ssoon as it hits 1.5 bars). another thing i was thinking, is that maybe i am hitting fuel cut, because i got rc550cc injectors and a 255 walbro fuel pump, and as of right now am getting 11mpg==rich as a b*****. so maybe it will be fine after tuning my afc? that sounds anything like a possibility to anyone?