Usually in the morning, when it's cold or if its been raining the night before, my start up and idle fine. But 1st and 2nd gear will start to stutter around 1500 to 2000 rpm while accelerating. By 3rd gear it's near stopped. Once I've gotten a good 15 - 20 mi. on it, it goes away. Although it seems to getting even worse. The other day the truck wouldn't start, it would turn over and over, then stop suddenly like a dead battery. I would immediately try again with same results but when I released the key it tried to fire but failed. After a few more tries it threw a p1351 code. But I did finally get it to start. Hasn't throw that code since. But having the misfire under load while it's cold outside. Thanks in advance for any ideas.

I'm trying to diagnose a wheel oscillation and vibration issue that's been going in for several years and driving me nuts. Vehicle is a 2004 Toyota Tundra 2WD. The truck came with the larger 13WL calipers and I just replaced them last summer. The issues I am experiencing: 1) Vibration, most noticeable at highway speeds. Sometimes so bad it feels like my tires are oval shaped. 2) Greatly accelerated rotor "warping". I've replaced the rotors multiple times and the issue goes away but progressively gets worse over only a few hundred miles. 3) Suspesion bounces when braking, most significant at 23 mph and 45 mph. There is very little if any vibration felt through the brake pedal. It is mostly felt through the suspension. 4) Subtle bouncing while driving at 23 mph and 45 mph. If I apply steady pressure to the brakes while holding my speed steady at either of these speeds, the bouncing is continuous. 5) Scraping sound when rotating hub my hand (caliper removed). No apparent looseness. Of course me tugging on it with my hands is much different than the actual forces when driving. Things I've replaced: Calipers, rotors, pads, tires, wheels, lower control arms, tie rod ends, lower ball joints. None of these things resolved the issue. There is no perceivable play in the when shaking the wheels at 6 and 12 and there is a little movement when shaking the wheels at 3 and 9, but the opposite wheel moves in unison and there is no slop. There are no audible noises, pops, or clunks. Just vibrations and hopping. The only suspect parts I haven't replaced are the steering rack and the wheel bearings. I mention the steering rack only because the seals are leaking, but the steering feels nice and tight and the power assist is good. The wheel bearings are highly suspect because I would imagine if they arw bad that there would be vibrations at high speeds and since the hub is connected to the bearing and the rotors to the hubs, this would cause the rotors to warp quickly. I recorded some temperatures after driving about 15 miles, over half of which was 50+ mph and the remainder 35 mph. Things cooled down about 10 minutes before my measurements and the ambient temperature was 50 F: Left rotor: 300 F Right rotor: 400F Left caliper: 175 F Right caliper: 230 F Left bearing: 100 F Right bearing: 125 F As you can see, the temperature of the right components are significantly higher. Whether or not these temperatures are typical is beyond me. What do you guys think? Bad wheel bearings?