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Chevrolet S10 Questions

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for 2 months now the engine would be running fine but I would notice the accelerator needle jumping to 20 or 30 as I was driving and the battery and seatbelt lights would come on then shut off. Yesterday I noticed that it was doing that more violently and the engine starting to cut out if I was accelerating out of an intersection. As I drove it more, it started getting better but wondering what would be causing this.
It idles fine but when I start going it chugs hard in second and third gear. If I let off gas and then push back down it helps, then at highway speed you can feel a very slight chug or miss, what can this be?
engine idles fair in neutral but in gear (auto trans.)the engine mis fires badly and stalls. Mostly happens when weather is wet and hasn't been driven for a few days. Could it be condensation inside the distributer cap?
I replaced resistor,and relay. All fuses under dash are good. No power via test light to switch in dash. Blower works ran directly to battery.
The coolant goes into the recovery system tank. When it cools, the coolant goes back into the system. I have changed the water pump, thermostat, pressure cap and the radiator is only 2 years old. I have also changed the heater core. I cannot think of anything else to do to fix the problem.
Do I have to drop the trans?
I recently bought this truck (PP) and it runs well but after about two weeks I noticed that the fuel gauge and thermometer and Odometer weren't working correctly and although I know what to do about the fuel gauge and thermometer; I don't know what to do abut the odometer
I have a Chevy S-10 4.3 V6, and I have looked everywhere and cannot find a code list for the OBD system. This year specifically, has a unique system. It took me many hours and trial and error to even get the codes to flash. I had to short Pins 4 & 12 (or pins 5 & 12). And instead of the "Check Engine, or Check Guages", it's the "Brake (!)" light indicator that flashes the codes. There were 22 codes in all. I need an EXACT code list for this specific make/model/year. Considering it's that in-betweeny time, it makes things complicated. The fact it's a 16 Pin connector, it cannot be OBD 1. Also, it did not start the sequence at Code 12, as most listings show. When I checked the codes, it started at Code 46. The pins that are used on the connector are as follow- 4,5,6,9,12,16. The 8th VIN is Z. If any more information is needed, contact me via e-mail at: HighwaytoHell13@hotmail.com
The head gasket was just changed and the head was checked. It was fine also the block deck was fine
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