Nissan Repair: FUEL LOADING AND BACKFIREING, nissan 4x4, vacuum diagram

Question
I HAVE A 87 NISSAN 4x4 PICKUP, I STATES FINE BUT WHEN YOU ACCELUATE THE TRUCK BOGGES DOWN LIKE IT IS GETTING TO MUCH FUEL AND WILL BACK FIRE. I HAVE REPLACED ALL THE VACUM LINES AND IT STARTED AFTER THIS DO HAVE ANY IDEA WHAT COULD BE CAUSEING  THIS PROBLEM.

Answer
Davey,

You have a vacuum line or two that are hooked up incorrectly.  I would look under the hood at the vacuum diagram sticker and make sure those lines are correct and then get a copy of a factory manual and see if any of the other ones are connected to the wrong thing.  Remember that there are check valves and one way valves along with vacuum amplifiers and such that are integrated into the vacuum circuit so you need everything to be as it was before.  I like to look at other trucks and cars of the same year and use them to validate the hose routing.