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Yes , definitely get a real boost guage.
I'm running 15 psi with no issues , so you must be spiking quite a bit beyond that. I'd say you were getting into some MAF over-run , which will probably happen around 17-18 psi , I haven't tested that theory yet , though. Be careful , the studdering can be a side effect of the knock sensor wigging out because of knock and pulling timing into the negative. You may or may not actually hear the knock , depending on if the knock is in a cylinder near the firewall. Be careful with that , because knock WILL kill the stock head gaskets , for one , and heavy knock in even one cylinder WILL melt the piston.
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1992 Yamaha FZR 1000. 145 Hp, all stock..
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