okay i have a 98 f150 4.6l 116000 miles and it just started running like **** last nite. wen its idleing it runns smooth but its got like this wierd missing kind of sound. and wen im driving it around 2200 rpms to 3200rpms it runs like **** sounds like its all loaded up and missing and it kinda has a wierd shaking feeling and missis a litle.

help please im leaving for vacation in a little

 

has it ever been tuned up? i'd do motorcraft wires and plugs. what kind of air filter are you using? if its an oil charged filter i'd clean the maf sensor. and does it matter how fast you are going? not just rpm but whether or not its worst in different gears.

 

it doesnt realy matter wat speed like i went on the freeway an had to pass someone and it had no power and just made made a bunch of noise and stated to miss a little. i changed the spark plugs and wires 20 thousand miles ago. it has a brand new kn slip in airfilter. it sounds the same no matter wat gear im in

 

what brand plugs and wires? and the air filter may have contaminated the maf sensor. you may need to clean/replace it. is the cel on?

 

im preety sure i used motocraft plugs and wires and ya the cel is on

 

do you know what the codes are? if not you need to get them first because there are quite a few things that could cause the problem.

 

no i dont have the codes im just gonna run it till it brakes and hope i can go on my camping trip and it doesnt get worst. i got a snapon scanner but i just cant get down to my shop till next week so ill have to wait on the codes

 

you can get the codes read from a local autozone for free.

 

o i didnt no that i never have herd of a auto zone doing that out here in california

 

May be the MAF fouled which is easily cleaned or could be a fuel filter.

 

sounds like the maf to me. Probaly from the air filter had the same problem

 

wat should i use to clean the MAF i have some starter fluid can i use that or would it be beter to use carb cleaner

 

NO! You must use the electronic cleaner. You can get it at a parts store. And, if you don't know, you must not touch the little wire sensor in the MAF. You just spary it well and let it air dry.

 

Getting the codes read would be the best first step.

 

thanks guys ur alot of help im gonna try somthing