my 88 ram 50 with a 2bbl 17,XXX miles on it I had a very similar problem it had a loss of power, would not go over 55mph, would barely run on its own, fuel got in the oil, bad gas mileage, and it smoked really bad out the exhaust. I thought it was a timing belt was off by a tooth or two, but when I checked it was fine. I did a compression test on it and it passed perfectly (I didn't think it was the rings with it only having 17k on it) so I took it to my automotive class and I did an ignition scope on it to find out spark plug wire 2 and 3 were switched. after that I cleaned the plugs and changed the gas filled oil and boom he runs great now... I bought it for 700 thinking it needed an engine to figure out it was 2 and 3 spark plug wires were switched
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