That engine should run just fine on cheap gas. Knock sensor should be telling the computer to dynamically retard the timing to keep it from knocking. Take it to someone with a good diagnostic tool & see what"s up...not all error codes will set the SES light. A good scan tool should also be able to monitor timing in real time as your drive to see if its tracking as it should.
Knock sensor on the edge of failure is the most likely culprit, but not the only possibility. Need to know what"s going on before spending a bunch of money throwing new parts at it.
If a knock sensor is cheap and you can replace it yourself, might be worthwhile just to eliminate one possibility. Otherwise, if its not setting the SES light, this is a job for a scan tool that can read the manufacturer unique codes.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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