Ok. So my car has been runing like **** lately. It will start fine, but after a while, it will start to miss and than eventually stall. I ran codes and it gave me 3(map sensor) and 22(vtec pressure valve). My question is how hard is it to replace the pressure valve, and where is it located. Also my car is a 95 Civic EX Coupe with a VAFC, I/H/E, and removed Emissions. Could the codes possibly be caused by the VAFC? I have had all this stuf done for about 6 months now and no problems until a week ago.