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No codes have come up. Check engine light has stayed off. We did a scan awhile ago and it was related to the TPS. I had an aftermarket one and swapped it for a motorcraft.

Hey! I have a 1993 Mustang 2.3 5-speed that's all stock. I love this car but recently I've had some issues with the idle. For awhile, I'd start the car and the RPMs would fall to about 500-600 then raise up to about 1500, and repeat for a little. It would usually go away after it started to warm...