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Could be a leaky fuel pressure regulator, or a weak fuel pump check valve. When the engine is off, the fuel pressure should remain fairly constant. If it bleeds down quickly, it could be either of those. When it's cold, the fuel doesn't vaporize as easily, so it might be easier to start. When...

1. No, you can't access the sensor from inside the cab. It's on the transmission housing, outside. You'll need to get under the truck. A swivel socket and/or extension might help with that bolt. PB Blaster penetrating oil can help too. 2. Yes, the output speed sensor (OSS) can absolutely cause...

Check your battery connections and grounds. A loose or corroded connection can cause all sorts of weird electrical gremlins. Also check the large wire going from the alternator to the battery. A bad connection there can cause similar issues.