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First he needs to verify that they are on correctly. Did it run bad before? did he "guess" thats what the problem was? is it worse now, than it was before? The coils should be marked as to what cylinder they go to. I could send a diagram, but dont know what engine you have? the rear cylinders are 1 3 5
The firing order happens to be 1-2-3-4-5-6. When looking at the front of the van, #1 is on the left towards the rear. #2 is on the left towards the front, #3 is in the middle rear, and so on.
has the fuel filter been changed and can you hear the fuel pump in the gas tank come when the key is turned to the on position - should come on for 3 seconds to build press. for starting car
Im having the same issue I believe. I have a 94\' Chevy 1500 and when i accelerate it will jerk like the gas has cut out but it wont stall. It just jerks and slows me down. It only seems to do it when going up a hill. I feel like it could be the fuel pump or possibly some intake gaskets?
did they change the fuel filter??? if so then i would check to see if you have a miss in one of your cylinders this can be chacked as easy as turning your car on and going around the the muffler and listening to see if it makes a funny noise something like a low cough nothing loud just a little cough. if you cant hear anything like that take it in to a mechanic and have then check the pressure in each one of your cylinders
if it is not either one of those that i am not sure either hope it helps
1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6
1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6
4.0L Engines Firing Order: 1-4-2-5-3-6 DIS Ignition System
1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6
1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6 
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