[KevinCro]

I have a 2000 Ford Ranger 4X4 4.0 engine. I was on the interstate the other day and it started bucking at about 60 mph. It did this for about a 1/4 mile and then quit. I suspect a misfire.

Also, whenever I go to start it in the mornings after it has sat all night, the engine will idle rough for about 20 seconds and then smooth out. I don't know if these problems are related.

I have not had any dash lights to come on.

 

[71LTD]

how many miles are on it & are the factory ignition components still on it?

 

[KevinCro]

The truck has 96k on it. The wires are only a few weeks old. The plugs have been in there since last year. The coil/distributor is original as far as I know. The IAC is new, I tested the TPS and it checks out. I replaced the lower and upper intake gaskets a few weeks ago. I've cleaned the MAF and the Throttle body. I ran a compression check on all of the cylinders. Each cylinder was within the proper range. The PCV valve is new. IF I think of anything else I will be sure to post it.

 

[Boghog]

Sounds like a coil or wire or both.Is it wet where you are,meaning was it raining when this hapened?

 

[KevinCro]

Sounds like a coil or wire or both.Is it wet where you are,meaning was it raining when this hapened?

It hasn't rained here in a week at least. The conditions were dry and warm. I'm thinking the wires are bought are junk. They seem to only half way want to fit down on to the distributor.

 

[Poppy]

Well that could be your problem, and it may be causeing the shifting problems you posted in your next thread. If the engine is not running properly the trans may not either.

 

[TBIRD430]

I'm thinking wire too, but fuel filters are cheep & you didn't mention when it was changed last....?