I have a 1994 ranger 2.3LAbout 2 weeks ago while I was driving it started runing real rough and sound like a small motorcycle but quit after about 20 sec and started running normaly, it did it again about a week later lasting only a few seconds. nows does it after driving a few miles but does it intermittently . When its running rough only cylinders 2&3 on intake side is firing cylynders 1&4 and all on the exhaust side not firing at the coils. it has strong gas smell and catalitic converter gets hoter than normal. truck has 288,000 miles been running good. tried new coils but still does it. Has new catalitic and o2 sensor. any ideas ?