I think i marked the wires wrong on my 04 f150 heritage. 4.2l v6. Plugs 4,5,6 what is the order from front to back on the coil cap for the corresponding wires.

Recheck to ensure that you have all cylinders in proper firing order. It sounds like you have crossed some of the wiring.

firing order is 1-4-3-6-2-5.
physical cylinders and corresponding plugs and wires:
6-5-4 drivers side back to front.
3-2-1 pax side back to front.

You probably have a 4.3L V6:

V6 engine 2.5 liters. Engine Info

Firing Order: 1-4-2-5-3-6

Cylinder Numbers

Firewall
1 2 3
4 5 6
Front of Car

Coil Pack Numbers

_______
4 6 5
3 2 1

For the 2000 Chevrolet Impala 3.8L V6:

Firing Order:
1-6-5-4-3-2

Cylinders:
.....(back).....
|...2...4...6...|
___________
|...1...3...5...|
.....(front)

Ignition Coil Connections:
(back)
o <---6
___
o <---3
o <---2
___
o <---5
o <---4
___
o <---1
(front)

Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered question.

For the 2.8L
Firing Order:
1-2-3-4-5-6

Cylinders:
......(back)
1.......3.......5
2.......4.......6
......(front)

Ignition Connections (Spark Coils):
........(back)
.|.1..4.|.|.6..3.|.|.2..5.|
........(front)

Again my apologies....
Let me know if this helped...

Check the spark plugs which is the check wrong with these pickups the coil gives up cable cable problem in the coil and a spark that really is the best test and if all works well you maybe have any problem injector.

The COIL PACK TOWERS are numbered : coil----3---4 pack---2---6 plug----1---5 ----------------------------------------------------------------- The engine cylinders / spark plugs are numbered : passenger side , front to rear , 1 , 2 , 3 -----drivers side , front to rear , 4 , 5 , 6 ------------------------------------------------------------------- The spark plug firing order is ( 1 -4 - 2 - 5 - 3 - 6 )

found this online hope it helps

Which motor i-6 or v8?
look on the intake for firing order if it's the inline 6 from front to back they are numbers in order 1-6,using the timing marks set the engine at 0degrees on compression stroke and number 1 plug wire will be directly above where the rotor button is at I think the firing order is 135624 from number 1 on cap and going clockwise put the plug wires on the cap to the plugs in that order.

i would start with the basics- did you make sure you followed the correct firing order when you installed your new plug wires? when you changed the cap/rotor did you notice any track marks inside the old cap? was the old rotor burnt/corroded? ive got a 97 ram and the cap is a b*tch to get to being buried in the back, could you have inadvertently moved the rotor off its timing mark? mis-aligned the crank sensor when installing your new cap? i would recheck how the cap was installed, just because you were able to position it proper and tightened down the screws doesnt mean that you didnt accidently pinch the wires on the crank sensor, or turned the rotor off its mark. also when pressing on the plug wires on the cap did you look for the "1" mark on the cap? this is your reference point for firing order. im not sure these are you problems, but rechecking your work to make sure something wasnt knocked off-kilter, or wrong plug wire placement would confirm the problem lies other than what was replaced. i hope this helps