If i had a burnt or warped Valve would it make noise and give crappy compression? I've been working on my 87 vulcan and i replaced every sensor i mean every sensor and i have new distributor plus cap rotor. I even replace the upper and lower intake gasket lifters Injector o-rings antifreeze i put in synthetic oil fuel pressure regulator fuel and air filter and i STILL get a miss upon deacceleration and the idle surges upon start and i cant get it run in the morning. I've hooked up my scan tool and i have no data and no codes. i forgot i replaced all my vacuum hoses and i get 15-20 vacuum pressure 35-40 psi fuel standard plugs and wires cap and rotor i get 165-175 pounds of compression the engine inside was clean no carbon build up .I also ran an cleaner in the fuel system. I have ran out os IDEAS this only happens sometimes when i put the car in park the backfiring goes away. the backfiring is so small that you can only feel it on your foot. You can not even hear it it is barely noticeable by the ears. The surging in the Idle happens all the time it seems to LOOK for idle I have and doubled checked the IAC and it is not the problem. I need more ideas It is also running rich I had the injectors tested and they are fine with no leaks NEED HELP PLEASE