Hey there I have a 94 Chevy Silverado with a 5.7 liter v8, the other day I changed the spark plugs and crossed up two of the plug wires but I fixed that and no more service engine light BUT now it shakes extremely hard while idling and its making a small noise I'm in the dark right now your help is what I need

you cross two of high tension lead for the spark plugs.

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 !!

with a 5/8 inch spark plug socket and a rachet. simply pull the wire off of the plug, change the plug , then push the wire back onto the plug.

you have crossed two of the wires. 5.3 liter is 1 8 7 2 6 5 4 3.....4.2 liter is 1 5 3 6 2 4 ... If they are not crossed double check the spark plug wires for any breaks of bad plug boots and make sure the wires are not touching the minifold this will cause the spark to jump

1-8-4-3-6-5-7-2

Distributor turns clockwise. Number 1 at 5 oclock position. Firing order is 1-6-5-4-3-2

Sounds like your timing is off when you placed the distributor back in or your spark plug wires are crossed. Start with the simple and check the spark plug wire firing order. 1-8-4-3-6-5-7-2 Cylinder numbers drivers side 1-3-5-7 radiator to firewall. Cylinder numbers passenger side 2-4-6-8 radiator to firewall. Distributor cap #1 is at 5 O'clock and rotates clock wise. Once that is establish to be good then make sure the cylinder 1 is at TDC with the distributor rotor at the #1 position. Good luck and hope it's a crossed firing order.

You didn't mention the engine, so here are all options...

4.3 liter V-6 VIN "W" With Enhanced Ignition System


1996 Chevrolet C 1500 P/U 2WD
5.0 liter V-8 VIN "M OR
1996 Chevrolet C 1500 P/U 2WD
5.7 liter V-8 VIN "R "

spark plug wrench and alot of patients with the very back ones hard to get to

Since you didn't state whether it is a V6 or V8, I'll give you both.

V6 -4.3Liter
Firing Order is 1-6-5-4-3-2
Distributor rotor turns Clockwise
Number 1 spark plug tower on distributor cap, faces the front of the engine.

->Drivers side, spark plug order in engine, starting from the Front going back:
1-3-5
->Passenger side, spark plug order in engine,
starting from the Front going back:
2-4-6

If it's Electronic, the distributor cap has a Left side, (Drivers side), and a Right side, (Passenger side)
Starting from the Front, going back on the Left side,
3-1-5
Starting from the Front going back on the Right side,
2-4-6

V8-5.0, 5.7, and 7.4Liter
Firing Order is 1-8-4-3-6-5-7-2
Distributor rotor turns Clockwise
Number 1 spark plug tower on distributor cap,
faces Front, towards the Drivers side.

Electronic distributor cap has two sides. Drivers, (Left), side and Passenger, (Right), side.
Starting from Front going back on Drivers side,
1-7-3-5
Starting from Front going back on Passenger side,
8-2-4-6

Spark plug order in engine, starting from Front going back, Drivers side:
1-3-5-7
Spark plug order in engine, starting from Front going back, Passenger side:
2-4-6-8