I recently purchased a 93 mustang 2.3 ltr. The motor was surging and the temp gauge isn't working, so I replaced the temp sender on the back side of the motor. Now the idle is holding steady around 500 rpm, but the gauge still isn't working. Also, the check engine
light is on. I haven't gotten it scanned yet (which will be the next step once I have a chance), but I'm curious to find out what might be most common. Any ideas would be appreciated.