1999 Frontier 2.4l 2wd

Need a little help, #4 misfire code i have changed plugs ,wires, distributer cap and rotor still no change replaced air filter checked for vacuum leaks tried crimping vacuum line to egr valve and checked ohms on injectors which are 10.3 to 10.5 on all 4 truck misses at low rpm's while through town as well as under load at stoplights but seems to accelerate great once i get above 2000 rpm's any thoughts? 212000 miles

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