First, what have you done to your ride? like any mods??? To me, it sounds like vauum leak. Yea, check all your vacuum hoses for vacuum leak and importantly, check your Fuel Injectors to see if the O rings are losen or worned out. If they are, then you need to replace them or tighten them up if they're loose. Cause those injectors's seals are VERY VERY important, it can cause for gas leaking and Will make your car detonate as well as your RPM goes up and down or missed adjustment. Just for your security, Do Not Drive your car for 10 mins after messing with the Fuel System (ex: fuel pump, fuel injectors, any fuel source) Let it idle for about 10 mins. Hope this will hellp!