O2 or MAS sensor(s)

[irelandmoss]

I have a 94 XLT. The truck started bucking like a
crazy horse in any gear when the check engine
light comes on. When the light is not on the truck
runs fine. Could it be any one of those sensors or
something different. The engine was replaced with
one out of a 1993. I would be grateful for any help.

 

[MrShorty]

Could it be any one of those sensors or
something different.

Short answer, yes, it could either of those sensors or something different.

1st step would be to run the self-tests and see what trouble codes are reported by the computer. There's MadExplorer93's sticky in the Under the Hood forum and my "notes on pulling EEC-IV codes" in the EEC-IV forum which should be enough information for you to figure out the self-tests. Then BrooklynBay has posted EEC-IV code lists in the EEC-IV forum.

Once you have the results of the self-tests, report back.

 

[irelandmoss]

Talked to a mechanic and he told me that
itm could be the T.P.S. I changed it and
still nothing. Now it turns over but does not
start.

I do not have a computer to check the codes.

I did print out your pages of codes.

I'm getting the flare ready to throw inside it.

AAAAAAAAAHHHHHHHHHHHHH!!!!!!!!!!!!!!!

 

[MrShorty]

I do not have a computer to check the codes.

Either we're not communicating or you didn't read the references I gave you. You don't need any kind of computer to pull codes on your '94. A paper clip (and the computer between your ears for counting flashes) is all that is required.

 

[techieman33]

also most auto parts stores will check your codes for free. Have you checked your spark plugs and wires? You might be down a cylinder.