Maybe one of the ignition blocks kicked the bucket and you are only running on one bank of plugs???
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2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
1999 Honda CR-V EX, RT4WD, 2.0L, 5 Speed MT, 4.56:1, open differential
did you check the spark plugs, is it missing try unplugin TPS, put in drive troubleshut. if its missing check coilpack @ under coil pack check injectors. ?map senser? were did you get the MASAIR junk yard if so try uplugin it to troubleshut. listen for changes in motor. if one spark plug is black,its that injector