help tj

I have a high-pitched pitched almost electrical sound for a short time after start which is new. When going downhill only the jeep sometimes idles quite low, almost stalls unless the engine is rev'ed. Recently done spark plugs, tps, cleaned iac. doesn't look like leaks, the high-pitched whine is...

I posted a separate thread thinking it’s a separate issue but now I realize they correlate. I have an 04 wrangler and the dash lights went out I’ve been trying to diagnose it. Today my Jeep beeped at me but didn’t throw the engine light on. I checked the code it’s 1687. How do I fix this? I...