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Two things to check - The therostate may need replacing. AND, the throttle position sensor mounted on the side of the air intake - opposite the throttle linkage - may be bad. The TPS is a poteniometer of sorts. About $50. You can test it in place. Removing it can present a problem in getting it back to the EXACT position it was in before being removed. It sends signals to the computer at idle and full throttle. The mid-range throttle position fuel control is determined by the computer. Another item to check is the water temperature switch near the thermostat. Sometimes you need to put a water hose clamp around it for it to make good contact.

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Q: Why does your 1989 Ford Ranger heat up fast after being started and putter on the highway after being driven for only 5 minutes but if you let off the gas it will run smooth?
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