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Cold starting misfires can often be caused by either tired high tension spark plug leads or ignition coil packs. If replacing leads, then replace with a full, new set. Coils can be changed individually, but it is often the case that if one has failed, then the others aren't far behind. Some cars have individual coil packs on each spark plug. Some cars have a single pack for all plugs and some have coil packs which may control two or more plugs.
To check for a misfire (ignition failure) follow these steps:
(Cold start) (Use a pair of insulated pliers)
1) Start the vehicle
2) When the vehicle starts misfiring, disconnect plug leads or coil pack connections one at a time. If the vehicle idles even more roughly, then that plug or pack should be considered fine.
Replug each connection before disconnecting the next one. Once you disconnect a plug lead or coil pack connection and find no difference in poor engine running, then you have likely found the offending cylinder. Check the spark plug condition, lead and/or coil condition and connections on that cylinder.
If you pull the plug wire from the spark plug on cylinder 3, is there any oil, water, or antifreeze in there? Have you removed the plug to see what condition it is in? If it is black or oil-fouled, you should replace it, or better yet, the entire set of spark plugs. When the coil pack was replaced, was the plug wire replaced as well? I have seen a stuck fuel injector cause your problem before, because the cylinder does not get the right amount of fuel, running either too lean, or too rich.
More than likely , I hate to say, it is the coil packs. If the plugs were fouled it would not change to running fine after warm up. If you do change the coil packs, change the plugs while you are in there.
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