Howdy Ford ranger owners.
I have a 2000 Ranger XLT 4x4 with 4.0 engine Runs like a top until it some how stops firing in 4th cylinder after about 2,000 miles. Engine will start ideling very rough( Engine light will turn on) and miss badly when driving it. So to fix this I change the fourth spark and instantly the truck runs like a top for another 2 000 miles although some times it will ideal rough with out engine light turning on and I gun it a couple of times and then drives fine. Had one car mechanic say " Its either a vacuum leak,bad fuel injector,warped head,or Bad valve..... Truck has been doing this since 29,000 miles it has 62,000 now. I can easily pass other cars going up hills. Another mechanic says its the coil or maybe I could just change that plug wire?????? So what is my problem? Truck doesn't burn oil.When I remove spark plug it doesn't look burnt,some times it looks like the gap is bigger then the .054 its supposed to be. Also its a gas guzzler about 15 miles to the gallon I have off road tires on it.Oh its a automatic transmission.