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TPS issues

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Hello. I have been having an issue with my 88 Comanche. 1 out of 5 times (more or less) when I start my engine, the rpms rise to 4000 and stay there until I unplug the 3 prong part of the TPS sensor. My truck is an automatic so it has the 3 and 4 prong clips. After I unplug it, the rpms go back down to normal. I plug it back in and everything is fine. I thought my sensor was bad so I just replaced it with a new one. But lo and behold the same thing happened when I went to start my truck, testing out the new sensor. I'm not sure what to check now. Any help would be appreciated. Thanks. 

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10 hours ago, 54bobby said:

not sure if this would apply but did you disconnect the battery so the ecu can relearn and recognize the new tps?


Haven't done this but I'll give it a shot

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