Well in comes the cold weather, and new car problems. Since the weather started getting cold at night, and still warm in the afternoon ( Utah ), my truck decides it wants to hesitate. It will do it every morning without fail. Whenever the engine is completely cold at the start of the day, it will hesitate at like 2.3k-2.6k RPM on every shift - the RPMs will just stick in the same spot for about 3-5 seconds and then all of a sudden it will just start going again. When I put the pedal to the metal, it will hesitate longer than just lightly accelerating it seems. Then sometimes, but rarely, when I turn off my truck for an hour or so and the engine is still hot, when I start driving again I can feel a little hesitation, but just a hare compared to when it's stone cold. Most times when the engine is hot though, it won't hesitate at all. I was told it's something on the fuel side of the spectrum... any suggestions please? I'm selling my truck soon so I need to get this fixed ASAP. I've replaced the fuel filter already. I removed a spark plug from each side and they both looked pretty clean, not gunked up by an means, so I haven't replaced them yet. I've got 75k on it, and it was a lease vehicle until 65k, so I'm not quite sure when the plugs were changed last - but they do look good.

The funny thing is though, when I start it up on a cold morning, the first one or two times through the gears, it will accelerate just fine. However, after 2 stop signs and about 300 meters later, that's when it will start to lug until it gets warm. The easiest way I can explain it is like this : when I turn off the engine at night to park it, there's plenty of fuel left in the fuel lines. Then in the morning when it's cold, the fuel pump won't work efficently at first so once the truck uses up all the fuel in the lines ( running perfectly ) from when I parked it warm, then the fuel pump is struggling to pump out the fuel that it needs until it gets warmed up. I know it probably has nothing to do with the fuel pump, but that's how I'd have to explain it.

 

Sorry can't help. I haven't had any problems to your extent, although sometimes 1st and 2nd gear hold a little longer than I want it to while I'm driving. Anyway, here's a bump!