1999 Ford Ranger 3.0L Flex Fuel
Recently, with 180,000 miles, the truck started to idle rough just a little bit. It would seem to misfire every once in awhile while idling. When I accelerate, I have very little power and it is very sluggish. I have replaced the fuel filter, the spark plugs and PCV valve.
Today, I pulled the spark plugs (have 10k miles) and cleaned them. On the rear left cylinder (sitting in the driver seat) (#5 I think), the spark plug tip was black indicating an excessive fuel mixture. The other spark plugs look fine. The vacuum pressure was fine and the fuel pressure was 60# but quickly dropped to 20# after the engine was stopped. The shop manual indicates the pressure should stay around 60# for quite a few days afterwards. So I am thinking it has something to do with the fuel system but don't know what to do next.
I am thinking of changing out all of the fuel injectors and at the same time the gaskets for the engine. That should solve the idle problem. Please add any suggestions. The sluggish performance I think may have to do with a clogged exhaust system. What are your thoughts? Anything is appreciated.
1999 Ford Ranger XLT
3.0L V6 Flex Fuel
5 speed manual transmission