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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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