So I need a bit of help, my truck started jumping while driving is bad about 2 months ago and I've been working on it ever since. I replaced spark plugs spark plug cables and ignition coil, but tonight it started jumping again. It doesn't seem to matter what gear its in or how fast I'm going. But I have noticed that when it's cooler or I'm on a really bumpy road it gets worse. The only other thing I can think of is a fuel pump issue, but let me know if you have any suggestions

 

A few questions... What year? Mileage? You posted in the 4.0L forum so I'm assuming it is a 4.0L. Have you attempted to pull any codes from it? CEL or SES light on? By jumping do you mean surging?

 

It's a 94 with a little over 130000. CEL does come on bit I'm not sure how to go about pulling a code off of it. And as far as surging, thay could be possible. When it happens I lose power from the pedal to the engine, as if it were just running but nothing behind it, and then a moment later it kicks back in

 

Here's some info that may help you get some codes from your system... EEC IV Self Test hookup
eec iv self test hookup.pdf
Do the rpms stay the same, drop or do they go up when it seems like you lose power?

 

the RPM doesn't move to much, when it drops back in I'll get a slight increase, but not much