eratic throttle
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eratic throttle
Hi everyone. I have a 1986 Ford Ranger with a 2.9 V-6. When I rev the motor to 1,200-1,500 rpm's, it revs up and down. It only does it in this rpm range. I have put a new mapp sensor on, a new throttle position sensor, 2 new oxygen sensors, and a new egr valve. A mechanic told me that the o2 sensor wasn't reading right so I replaced it again. That is why I say that 2 new sensors have been installed. It didn't help. So I took it to somebody else who put it on the computer and it came up saying the egr valve, so I replaced that. Still no luck. However, when I un-hook the throttle position sensor, it runs smooth. As soon as I hook it back up, it starts surging again, even at an idle now. I am at a complete loss. Any suggestions or thoughts would be appreciated. Thanks in advance.
