This could be a problem with timing or you need to check the leads to the coil packs are on firmly.
If your engine has coil packs it will have one for each cyclinder. There are still a few engines that use just one coil but most use coil packs these days.
whenever you change the plugs it is a must that you change the coil packs and wires. for some reason the plugs never seem to fire properly with the old wires and packs. i replace everything about every 40,000 miles
four coil packs
Depending on the manufacturer, many coil packs mount on a large transistor plate that actually fires the coil pack. It's not uncommon for those transistor plate to fail.
Check the crank sensor
How many coil packs on a 1995 q45 infinity
your coil packs are bad. this is not cheap to fix. sorry.
Auto Zone will check your computer codes for FREE... It maybe a coil pack, or bad plugs/wires.
Bad plugs? Bad wires?
If the engine has "coil packs" then its has to. Does your engine have a distibortor cap or coil packs?
What engine do you have in your vehicle? If it is a 1.8T, your coil packs are on the very top of the motor. There are 4, one for each cylinder. Once you pull the plastic engine cover off (if you still have it) you cant miss the coil packs.
Coil packs are an essential part of an automobiles engine, therefore, you would commonly see coil packs with commercial vehicles. They are a key component in the starting of a vehicle as it aids in the sparking of the engine.