1999 ford ranger 3.0 auto extended cab flex fuel
problem is cylinder 3 misfire. truck now runs rough at idle all injectors tested good now after i replaced the bad one in cylinder 3. just replaced sparkplugs and wires, its a electronic ignition, replaced downstream o2 sensor. battery is brand new truck has 200,000 miles on it ran fine until the other day revved it to 3500 rpms and started to run funny, but seems like not on all cylinders it is getting spark on all cylinders and tested compression it is at 175psi all cylinders. fuel filter is new. havent tested fuel pressure. just lost ne help would be awesome. had a tech scan tool on it nothing stood out besides o2 sensor and cylinder 3 misfire.