Multiple Error Codes
I have a 96 Ranger SC 4x4 with a 4.0, automatic, and 90k miles. I haven't run the truck for two years and just got it on the road again. I replaced the plugs, wires, and coil pack. I'm getting a P174 and 3 misfire codes, 303,304, and 306. It does a lot of backfiring as you drive and seems to be a little (but not much) better when the overdrive is off. I have put two cans of seafoam through the system with little change. I have a new fuel filter but can't get the old filter off yet. Where do I start looking next?