I've got a 94 B4000 Mazda/Ranger 4.0 V6 has a bad skip at 1800 to 2200 rpm vehicle has 75K on it. I have cleaned MAF and replaced DPFE and all was fine. 12k later skip is back worse .cleaned MAF & replaced EVR valve for EGR nnot much better, dealer warrantied ... Login to read more.