1994 chevy 2500 spark plug wiring

Most likely causes if it crops up after an engine has been running ok.
1. Rust contamination in the distributor around the reluctor magnetic element for the trigger. fix: clean out all rust build up. The rust is magnetic due to iron content and it is conductive to the spark will result in cross over to a lower voltage cylinder namely the intake stroke as it is the lowest pressure, therefore the lowest spark voltage requirement.

2, Moisture or dirt in the distributor cap. Result is the same type of spark crossover as the rust build up.

3. breakdown of spark plug wire insulation causing spark crossover in wire loom. Fix new wires

that would be bad coil packs ,try switching coil pack cylinder 3 with 4or 5 and see if miss fire code changes if it does it's the coil pack .or its possible where they plug in at the bottom(there should be a small oval rubber gasket on coil pack to keep out corrosion or possible not making a good connection (loose) ,oil getting in there ,you can use a timing light to narrow it down faster, pull your plugs for those cylinder and inspect for damage or fouling.and lastly check your wires if any brakes or crakes and that they fit on plugs tightly.

firing order for 5.7 v8 is 1-8-4-3-6-5-7-2 mostly all of the chevy v8s are the same firing order. the rotor button in distributer turns clockwise, the cylinder numbers are 1-3-5-7 on drivers side, 2-4-6-8 is on passengers side. To get started get your distrutor cap[new one] look on the top you will see a #1that's where you begin you must know if if rotates clockwise or counter clockwise start in that direction then follow the firing order and cylinder line up. good-day!! if cap is not marked, just pull out #1 plug, put a straw or similar in plug hole on top of piston. turn engine over by crank in front of vehicle with a wrench, when the piston comes to the very top just before it starts going down. this is tdc. and rotor button should be pointing to #1 wire on dist, cap. follow from there. good-day !!

Hi, if it's a diesel engine, they all have to sit for some seconds because of the glow plugs. Some diesel don't send power to the starter until the glow plugs run for the pre-determined amount of time. There are many things that could be causing this. Fuel filter, clogged injectors, fuel pump going bad or bad connection to fuel pump. Try checking out for this things..
Take care

You maybe able to get it from the dealership, or a salvage yard, you can remove whatever wiring you need.

You do not specify if the starter is working....if it is....remove all your spark plugs and try it....I once had a vehicle with a blown head gasket.....a cylinder filled up with coolant from the radiator.....if the cylinder is full and the valves are closed....liquid can not be compressed....and it will lock the engine....removing the spark plug will allow the liquid to be pumped out....

To do a complete tune up:
Change spark plugs and wires
If equipped with a distributor
Distributor cap and rotor
Fuel filter
Air filter
Change oil and filter
Check all other fluids.

There are a lot of items that can cause a miss fire but not throw codes on the dash. The check engine light will not display at every problem. You could have a bad spark plug or wires. Certing vacume componets can cause it. Cracked heads or head gaskets could do the same thing with out throwing codes.

can u send me a picture so i can see?

The couple across the street from where I live, had the same problem. He also changed plugs and wires and even the coil. I told him to replace the rotor bug and distributor cap and all started running smoothly again. Looking at the bug and cap nothing looked bad other than a little wear. It even checked out using a meter. Only thing I could think of was that there may have been some hairline crake robbing the spark and causing it to missfire.... Don't really know.