I have a 1995 Ford F-150 and had to change the back gas tank out due to a leak. After that it keeps making a popping sound when you push on the gas pedal. We ran a code reader on it and the two codes are 311 and 332. We went and replaced all the components for the EGR, check the vacuum lines. There is no air leak. We replaced all the thermactor air system parts also. We changed the fuel filter twice, the timing is right we had it checked. Other things we replaced is the Manifold Absolute Pressure sensor, Thermactor Air Bypass, EGR valve position sensor. I don't know what else to do. I just need to get this truck running, for my daughter to drive to college, until the first of the year. If anyone has any suggestions of where to look next I would appreciate it.