very well could be a tps. it is a variable resistor, voltage at idle is about 1 volt then as you push the pedal down it increases to as much as 4.9 volts. when the wiper surface of the tps gets dirty or gets a worn spot the voltage will drop to o volts. this is a fine hairline fault and it will cause bucking and jerking and may die if this spot is close to idle position. the best way to test is a voltmeter on the tps signal wire and with key on press the pedal slowly all the way to wide open then back watching the meter. if there is a bad spot you will see the voltage go off momentarily. but it also could be many other things.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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