My truck is starting to act up.. dont know what it is, so i need your help guys..

It usually happens around 30mph. the truck starts to "buck"... it feels like im going over a bunch of pot holes, but im not.. If i let off the gas it stops, if i put the pedal to the floor, it will grab, but its really sluggish, but after a sec it clears up..

sometimes it will do it at around 60 to.. i dont know what to do.. i have plugs and wires on order, could that be it?

 

How many miles? Gear ratio? What trans?


I know you've got 35's.......I'm willing to bet that auto trans is about to go....

 

My tempo used to do that when I had it. It was a fuel filter.

 

plugs/wires

fuel filter

Betting its the plugs

 

injectors

vacuum leak

mass flow sensor


i am also hunting down the same symptoms. plus high idle.

 

mine had very similar it was a random miss turned out to be coil pack

 

many things doubtful its your trans though quickest thing pull the plugs and maf check them out

 

Betting plugs but clean your maf as well, also check to make sure all your wires are connected properly

 

thanks guys.. I really hope its not the trans...

Its got 81000 miles, 4.0OHV, 4.56 gears, and auto trans..

Hopefully the plugs will be here soon. and im bout to go use the search function to figure out how to check my MAF.. i know there was a thread on here a little bit ago..

 

i agree get a good pair of plugs and wires and your probs should be solved

 

That should really help out. Plugs and wires made a huge difference for me at 67k miles

 

Thanks guys.. i ordered motorcraft platinum plugs and wires.. hopefully they will be in soon.. maybe they will help with my crappy gas milieage too! lol..

 

i wouldnt have went with them but good luck to ya

 

Why not?? I'm doing plugs and wires this weekend. Just curious

 

Why not platinum? I run the autolite double platinum and they work like a champ, but i dont know 'bout the motorcraft

 

motorcraft is a ford product..It has to be good..Right???..lol
Side note:..Mine is doing that right now...I think its because of the cam shaft sensor.
Mine bucks under 2k rpms and sounds like it wants to die on me sometimes.

 

ok Alex, you cant go posting i shouldnt have done that in my thread without explaining why, it makes you sound dumb lol.. jk.. but seriously, why? are the platinum ones not better than the copper ones?

 

Platinums will last longer than the coppers, and as long as you are using Motorcraft, you will have the correct heat range, which is the most important.

Normally plugs and/or plug wires will cause a misfire, or bucking while under load. I don't think that is how you described your problem. I would scan
for codes, but I would bet on a bad MAF sensor.

 

Mine was doing this a couple months ago.
Turns out the idiot at the Dealer did not close the air box or tighten the hose clamp
at the Mass Air sensor after he loosened it. Tightened it up and no more bucking.