I am new to the WF, but I have a 1998 6 cyl automatic that has an intermittent misfire/backfire that only happens every few days, lasts only a few minuets then goes away. I have been to several mechanics (really good ones) I have replaced everything related to plugs, wires, distributor cap, map sensor, and I cant get it worked out. Afer every mechanic looks at it, I runs fine for a few days then back to the "burping". This is about to send me into therapy lol. Any help would be appreciated.