It doesn't really coast well but that's mostly because of the 32" tires, bad aerodynamics, and off alignment. The brake rotors, pads, and calipers were all replaced at the end of next year and there aren't any other signs of a sticking caliper.

Going to pick up Bosch plugs tonight and put then in tomorrow morning.

My dad suggested to put a gauge on the vacuum line to see if that showed anything wrong (PCV vibration). I'll be at my parents house tomorrow. Should I go ahead and test it?

 

Why not? If your Dad has the gauge and necessary fittings it'a a no brainer.

That's a good trick!

 

Lol! Back to the future?

 

Haha I read over that post twice and didn't catch that. Anyways something came up and it looks like I won't get a chance to touch the truck for two weeks so until then there is nothing I can do.

 

try changing out your plugs to the autolite 3923 plugs, they are one step cooler then stock, 4.7 really like a cooler plug, then the next 2 fill ups, go with 93 grade gas, something is choking the engine and a higher octane will help burn what ever it is out, and don't baby it either, if a cat was going and getting plugged, this is the best way to find out. and have you noticed any nasty black or white smoke from the exhaust?

 

How will running a higher octane in an engine tuned for mid grade fuel have any benefit?

 

I'm pretty sure doesn't really have anything to do with the octane rating. The premium fuels usually contain more detergents and can clean the engine out to a very small extent, or so I've been told.

 

I'm pretty sure if you go to a BP or a Shell or an Exxon, all the fuels have the same amount of detergents regardless of octane.

I've been wrong before.

 

it will help burn all that built up carbon inside the motor, ever seen a vehicle that has been babied by an elder, then someone buys it and beats the snot out of it, all that black smoke is the carbon that has been building up in the motor over time

 

But if all the fuels have the same detergents, then how does it make a difference?